2023 Audi A4 Checking and Filling Instructions

Welcome to the world of automotive perfection, where performance and luxury are combined with innovation. Few brands in the automotive industry are as respected as Audi, and in 2023, the Audi A4 is a monument to the company’s commitment to designing cars that reinvent driving experiences. The 2023 Audi A4 perfectly combines cutting-edge technology, tasteful design, and thrilling performance. The exquisite attention to detail that underlies this work of art is visible in every curve, line, and feature. We will cover the checking and filling features of the 2023 Audi A4 as well as the precautions that guarantee both a smooth driving experience and the lifetime of this engineering marvel. The 2023 Audi A4’s sophisticated external design radiates a sense of refinement from the moment you first see it. Both its visual appeal and aerodynamic effectiveness are boosted by the sleek outlines and angular proportions. An engineering symphony comes to life as we explore the engine compartment. It becomes crucial to routinely check essential fluids like brake fluid, coolant, and engine oil in order to maintain peak performance and ensure the longevity of the vehicle.

Checking and Filling

Fuel

Types of gasoline
The correct gasoline grade is stated on the inside of the fuel filler door.
The vehicle is equipped with a catalytic converter and must only be driven with unleaded gasoline. Audi recommends using TOP TIER Detergent Gas­oline. For additional information on TOP TIER De­tergent Gasoline, visit www.toptiergas.com. The individual gasoline grades are differentiated by octane ratings. This value is given with (R+M)/2 equating to AKI or in RON. The headings below match the sticker in the fuel filler door (examples):

UNLEADED FUEL ONLY MIN. (R+M)/2 87 Regular/ MIN. RON 91 Regular
Use regular gasoline with minimum 87 AKI/91 RON.
Audi recommends using premium gasoline with minimum 91 AKI/ 95 RON to achieve the rated horsepower and torque.

UNLEADED FUEL ONLY PREMIUM MIN.(R+M)/2 91 / SUPER MIN. RON 95
Using premium gasoline with minimum 91 AKI / 95 RON is recommended. If premium gasoline is not available, you can also use regular gasoline 87 AKI/ 91 RON. However this does reduce the engine power slightly. UNLEADED FUEL ONLY PREMIUM MIN. (R+M)/2 93 / SUPER PLUS MIN. RON 98 Using premium plus gasoline with at least 93 AKI/ 98 RON is recommended.
If no premium plus gasoline is available, you can also use premium gasoline with 91 AKI/ 95 RON. However this does reduce the engine power slightly.

NOTE

1. Filling the tank just one time with leaded fuel or other metallic additives will cause permanent deterioration to the catalytic converter function.
2. When gasoline with an octane rating that is too low is used, high speeds or heavy engine load can lead to engine damage.

TIPS
The vehicle may be filled with fuel that has a higher octane rating than what is required by the engine.

Gasoline mixture
Gasoline with alcohol (ethanol)
You can fuel your vehicle with unleaded gasoline that has an ethanol content of up to 15%, for ex­ample “El 5”.

Gasoline adapted to the season
Many gasoline fuels are adapted to the seasons. When the season changes, refueling at high-traf­fic gas stations is recommended. It is more likely that the gasoline will be suitable for the season there.

NOTE

1. Do not use gasoline that does not meet the specifications.
2. Ethanol fuels with a high ethanol percent­age, such as E30- El 00, must not be used. The fuel system will be damaged!
3. Methanol fuels with a high methanol per­centage, such as MS – M 100, must not be used. The fuel system and the engine will be damaged!
4. If you are unable to find out if a specific gas­oline mixture meets the specifications, ask the gas station operator or their fuel suppli­er.
5. Do not use any gasoline mixture whose composition cannot be identified.
6. Audi does not assume any responsibility for damage to the fuel system or for performance problems caused by using gasoline mixtures different from those specified. This type of damage also does not fall under the New Vehicle Limited Warranty or under the emissions control system warranty.
7. If you notice a higher fuel consumption or poor handling or performance problems due to such gasoline mixtures, Audi recom­mends fueling with unblended gasoline.

Gasoline additives
An important issue for many automobile manu­facturers is combustion residue in the engine that results from the use of certain fuels.
Although types of gasoline differ depending on the manufacturer, there are similarities. Certain substances in the gasoline may cause deposits in the engine. Additives in the gasoline that should keep the engine and fuel system clean do not all function equally. Audi recommends using TOP TIER Detergent Gas­oline. For additional information on TOP TIER De­tergent Gasoline, visit www.toptiergas.com.
If you use incorrect fuels over a long period of time, the maximum engine performance may be impaired by combustion residue.

NOTE

1. Damage or malfunctions caused by the use of incorrect types of gasoline are not cov­ered by the New Vehicle Limited Warranty.
2. Only gasoline additives that have been ap­proved by Audi may be used.

Refueling

Messages
The following messages may appear depending on the vehicle equipment:

Messages
If the indicator light appears with a corre­spond n g message, refuel the vehicle.
Tank system: malfunction! Please contact Service

There is a malfunction in the fuel tank system. Drive to an authorized Audi dealer or authorized Audi Service Facility immediately to have the malfunction corrected.

Fueling procedure

The fuel filler door is unlocked or locked by the central locking system.

1. Unlock the vehicle if necessary.
2. Press on the left side of the fuel filler door to open it.
3. Unscrew the tank cap counterclockwise.
4. Place the cap from above on the open fuel filler door.
5. Insert the fuel pump nozzle all the way into the fuel filler neck.
6. Begin fueling. Once the fuel pump nozzle turns off the first time, the fuel tank is full. Do not continue fueling, or else the expansion space in the tank will be filled with fuel..
7. After the fuel pump has switched off, wait five seconds before removing the nozzle to allow the rest of the fuel to finish dripping into the fuel tank.
8. Turn the fuel cap clockwise until it clicks into place.
9. Close the fuel filler door and then press on the left side until it latches.

The correct fuel type for your vehicle can be found on a label located on the inside of the fuel filler door. For additional information on fuel, For the tank capacity in your vehicle, refer to the Technical Data.
To reduce the risk of fuel leaking out or vapors escaping, make sure that the fuel tank is closed correctly. Otherwise the indicator light will turn on.

WARNING
Improper fueling procedures and improper handling of fuel can lead to explosions, fires, severe burns, and other injuries.

1. Do not smoke. Keep away from open flames.
2. The ignition must be switched off when refueling.
3. Mobile devices, radio devices, and other ra­dio equipment should always be switched off when refueling. Electromagnetic rays could cause sparks and start a fire.
4. If you do not insert the fuel pump nozzle all the way into the filler tube, then fuel can leak out. Spilled fuel can ignite and start a fire.
5. Never get into the vehicle when refueling. If there is an exceptional situation where you must enter the vehicle, close the door and touch a metal surface before touching the fuel pump nozzle again. This will reduce the risk of electrostatic discharge that can cause flying sparks. Sparks can start a fire when refueling.

WARNING
Audi does not recommend transporting fuel containers inside the vehicle. Fuel could leak out of the container and ignite, especially during an accident. This can cause explosions, fires, and injuries.

1. If you must transport fuel in a fuel contain­er, note the following:
2. Always place the fuel container on the ground before filling. Never fill the fuel container with fuel while it is inside or on the vehicle. Electrostatic discharge can oc­cur while refueling and the fuel vapors could ignite.
3. When using fuel containers made of met­al, the fuel pump nozzle must always re­main in contact with the container to re­duce the risk of static charge.
4. Insert the fuel pump nozzle as far as possi­ble into the filler opening while refueling.
5. Follow the applicable legal regulations in the country where you are driving when using, storing and transporting fuel con­tainers.
6. Make sure that the fuel container meets the industry standards, for example ANSI or ASTM F852-86.

NOTE

1. Remove fuel that has overflowed onto any vehicle components immediately to reduce the risk of damage to the vehicle.
2. Never drive until the fuel tank is completely empty. The irregular supply of fuel that re­sults from that can cause engine misfires. Uncombusted fuel may enter the exhaust system and increase the risk of damage to the catalytic converter.

For the sake of the environment

1. Do not overfill the fuel tank, or fuel could leak out when the vehicle is warming up.
2. Fuel should never enter the sewer system or come into contact with the ground.

TIPS
The fuel filler door on your vehicle does not lock if you lock the vehicle from the inside us­ing the central locking switch.

Fuel filler door emergency release

1. Seek help from a qualified person if you cannot open the fuel filler door.
2. Afterward, drive to an authorized Audi dealer or authorized Audi Service Facility to have the malfunction repaired.

Emissions control system

General information

WARNING
The temperature of the exhaust system is high, both when driving and after stopping the engine.

1. Never touch the exhaust tail pipes once they have become hot. This could result in burns.
2. Do not park your vehicle over flammable materials such as grass or leaves because the high temperature of the emissions sys­tem could start a fire.
3. Do not apply undereocly protectant in the exhaust system area, because this increases the risk of fire.

Catalytic converter
Observe the safety precautions c> page 223, Gen­eral information. The vehicle may only be driven with unleaded gasoline, or the catalytic converter will be de­stroyed.
Never drive until the tank is completely empty. The irregular supply of fuel that results from that can cause engine misfires. Uncombusted fuel could enter the exhaust system, which could cause overheating and damage to the catalytic converter.

Malfunction Indicator Lamp (MIL)
If the  indicator light blinks or turns on, there is a malfunction related to emissions which can, for example, cause poor emissions quality and damage to the catalytic converter. Drive slowly to an authorized Audi dealer or authorized Audi Service Facility to have the malfunction correct­ed. The indicator light can also turn on if the fuel fill­er cap is not closed correctly.

Engine compartment

General information
Special care is required if you are working in the engine compartment
For work in the engine compartment, such as checking and filling fluids, there is a risk of in· jury, scalding, accidents, and burns. For this reason, follow all the warnings and general safety precautions provided in the following in­formation. The vehicle’s engine compartment is a dangerous area.

Explanation of warning symbols: 

WARNING

1. Turn the engine off.
2. Switch the ignition off.
3. Set the parking brake.
4. Select the “P” (Park) selector lever position.
5. Allow the engine to cool.
6. Keep children away from the engine compartment.
7. Never spill fluids on a hot engine. These flu­ids (such as the. freeze protection contained in the coolant) can catch fire.
8. Avoid short circuits in the electrical system.
9. Never reach into the radiator fan. The fan is temperature-controlled and can turn on suddenly, even when the ignition is switched off.
10. Never open the hood when there is steam or coolant escaping from the engine compart­ment, because there is a risk that you could be burned. Wait until no steam or coolant is escaping.
11. The cap on the coolant expansion tank must never be opened when the coolant is hot. The cooling system is under pressure. There is a risk of burns
12. To protect your face, hands, and arms from hot steam or coolant, cover the cap with a thick cloth when opening.
13. Do not remove the engine cover under any circumstances. This increases the risk of burns.
14. Due to the risk of electric shock, never touch the ignition cable or other components in the electronic high-voltage ignition system when the engine is running or is starting.
15. If a gear is engaged while the vehicle is sta­tionary and the engine is running, do not press the accelerator pedal inadvertently. Pressing the accelerator pedal will cause the vehicle to move, and this could result in an accident.
16. If inspections or repairs must be performed while the engine is running, moving compo­nents (such as the ribbed belt, generator, and radiator fan) pose an additional risk.
    1. Set the parking brake first and select the “P” (Park) selector lever position.
    2. Always make sure that no parts of the body, jewelry, ties, loose clothing, and long hair can be caught in moving engine components. Before any work, always re­move any jewelry and/or ties, tie back long hair, and make sure all clothing fits close to the body to reduce the risk of anything becoming caught in engine components.
17. Pay attention to the following warnings list­ed when work on the fuel system or on the electrical equipment is required.
    1. Do not smoke.
    2. Never work near open flames.
    3. Always have a working fire extinguisher nearby.
18. All work on the battery or electrical system in your vehicle can result in injuries, chemi­cal burns, accidents, or burns. Because of this, all work must be performed only by an authorized Audi dealer or authorized Audi Service Facility.
19. limit your exposure to exhaust and chemi­cals to as short a time as possible.

WARNING
California Proposition 65 Warning:

1. Engine exhaust, some of its constituents, and certain vehicle components contain or emit chemicals known to the State of Cali­fornia to cause cane.er and birth defects and reproductive harm. In addition, certain flu­ids contained in vehicles and certain prod­ucts of component wear contain or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
2. Battery posts, terminals and related acces­sories contain lead and lead compounds, chemicals known to the State of California to cause. cancer and reproductive harms. Wash hands after handling.

NOTE
When filling fluids, be sure not to add any flu­ids to the wrong reservoirs. Otherwise severe malfunctions and engine damage will occur.

For the sake of the environment
You should regularly check the ground under your vehicle in order to detect leaks quickly. If there are visible spots from oil or other fluids, bring your vehicle to an authorized Audi deal­er or authorized Audi Service Facility to be checked.

Opening and closing the hood
The hood is released from inside the vehicle.

Observe the safety precautions, Gen­eral information.
Make sure the wiper arms are not raised up from the windshield. Otherwise the paint could be damaged.

Opening the hood

1. With the door open, pull the lever below the instrument panel in the direction of the ar­row.
2. Raise the hood slightly.
3. Press the lever in the direction of the arrow. This releases the hooks.
4. Open the hood.

Closing the hood

1. Push the hood down until you override the force of the struts.
2. Let the hood fall lightly into the latch. Do not press it in.

Messages
The following messages may appear depending on the vehicle equipment:

warning Hood is not locked. Stop vehicle and check the lock
The hood latch is not locked correctly. Stop im­mediately and close the hood.

WARNING

1. Never open the hood when there is steam or coolant escaping from the engine compart­ment, because there is a risk that you could be burned. Wait until no steam or coolant is escaping.
2. For safety reasons, the hood must always be latched securely while driving. Because of this, always check the hood after closing it to make sure it is latched correctly. The hood is latched if the front corners cannot be lifted.
3. If you notice that the hood is not latched while you are driving, stop immediately and dose it, because driving when the hood is not latched increases the risk of an accident.

Engine compartment overview
The most important check points.

Observe the safety precautions, Genera/ information.

1. Washer fluid reservoir
2. Jump start points:(+) under the cover, Charging the volt vehicle battery, Jump starting
3. Engine oil filler opening
4. Sticker for engine oil specifications
5. Coolant expansion tank depending on the engine
6. Brake fluid reservoir 

The coolant expansion tank and the engine oil filling opening may be located in different places within the engine compartment, depending on the engine version.

Engine oil

If the engine oil level is too low

1. Engine oil viscosity
2. Engine oil standard

If you need to add engine oil, use an oil that meets the engine oil standard listed on the sticker. The sticker with the specified standard is located in the front of the engine compartment. When using the specified engine oil, you can adjust the oil level as often as needed. If engine oil that meets the recommended speci­fication is not available, in an emergency you may add a maximum of 0.5 quart (0.5 liter} en­gine oil of the that meets the following different standard one time until the next regular oil change.

1. Standard VW 504 00, ACEA C3, ACEA C4, API SP or ILSAC GF-6A. All viscosity classes within these standards are permitted.

Audi recommends having the oil changed by an authorized Audi dealer or authorized Audi Service Facility.

NOTE
Audi recommends using approved engine oil that meets the respective VW standard. Using engine oils which do not meet these quality standards can cause damage to the engine. As an exception and only in an emergency, 0.5 qt (0.S 1) of engine oil that differs from the standards listed may be used.

TIPS
Audi recommends using engine oils provided by Audi Genuine Parts.

Messages
The following messages may appear depending on the vehicle equipment:

Turn off engine. Oil pressure too low
Stop driving and switch the engine off. Check the engine oil level.

1. If the engine oil level is too low, add engine oil. Only continue driving once the in­dicator light turns off.
2. If the engine oil level is correct and the indica­tor light still turns on, turn the engine off and do not continue driving. See an authorized Audi dealer or authorized Audi Service Facility for as­sistance.

Stop driving and switch the engine off. Check the engine oil level and add engine oil immediately.

Add max. x qt (x I) oil. You can continue driving
Add the amount of oil shown immediately.

Please reduce oil level
There is too much oil in the engine and there is a risk of damaging the catalytic converter or en­gine. Drive to an authorized Audi dealer or au­thorized Audi Service Facility immediately to have engine oil extracted if necessary. Avoid high en­gine speeds, full acceleration, and heavy engine loads.

Oil level sensor: oil change necessary. Please contact Service
Fuel has entered the engine oil. This will cause the engine oil level to rise slowly and the engine oil quality to decrease. Do not extract engine oil to reduce the level, because this will increase the risk of engine damage. Drive to an authorized Audi dealer or authorized Audi Service Facility im­mediately to have engine oil extracted.

oil level system: malfunction! Please con­tact Service
The sensor that checks the engine oil level has malfunctioned. Drive immediately to an author­ized Audi dealer or authorized Audi Service Facili­ty to have the malfunction repaired.

Oil pressure sensor: malfunction! Please contact Service
The sensor that checks the engine oil pressure has malfunctioned. Drive immediately to an au­thorized Audi dealer or authorized Audi Service Facility to have the malfunction repaired.

Please drive to warm up engine
Especially low outside temperatures are a main reason why fuel may get into the engine oil. The fuel can only evaporate from the engine oil if the engine oil temperature is high enough.
Drive in the “S” gear. Drive the engine at higher RPMs while avoiding full acceleration. You should drive for at least 30 minutes. The in­dicator light may not turn off during this time. Repeat the steps that are described at any time. Have an authorized Audi dealer or authorized Audi Service Facility repair the malfunction if the indicator light does not turn off after a few drives.

WARNING
When the message Please drive to warm up engine appears, adjust your speed accord­ing to the weather, road, terrain, and traffic conditions. You should never disobey the traf­fic laws applicable in the country in which you are driving in order to follow driving recom­mendations.

TIPS
The oil pressure warning  is not an oil level indicator. Always check the oil Level regularly.

Checking the engine oil level
The engine oil level con be checked in the MM/.

Observe the safety precautions, Gen­eral information.

1. Park the vehicle on a level surface.
2. Shut the engine off when it is warm.
3. Switch only the ignition back on.
4. Wait approximately five minutes so that the en­gine oil can flow back into the engine oil pan.
5. Applies to MMI: Select on the home screen: VE­HICLE > Settings & Service > Oil level.
6. Read the oil level in the display. Add engine oil if the bar in the oil level indicator is just below “min”.

NOTE
If the engine oil level is too low or too high, there is a risk of engine damage.

TIPS
The oil level indicator in the display is only an informational display. If the oil Level is too low, a minimum oil warning appears in the in­strument cluster. Add oil and close the hood. The current oil level will be displayed on the MMI the next time the ignition is switched on.

TIPS
The engine oil consumption may be up to 0.5 quart/600 miles (0.5 liter/1,000 km), de­pending on driving style and operating condi­tions. Consumption may be higher during the first 3,000 miles (5,000 km). The engine oil Level must be checked regularly. It is best to check each time you refuel your vehicle and before long drives.

1. Because of the lubrication and cooling of the engine, combustion engines consume oil. The oil consumption varies depending on the engine and may change during the service life of the engine. Engines generally consume more oil at the beginning during the break-in period. Then oil consumption stabilizes after the break-in period.
2. Under normal conditions, oil consumption depends on the quality and viscosity of the oil, the engine RPM, the climate conditions, and the road conditions. The dilution of oil from condensation or fuel residue as well as the age of the oil also play a role. Because engine wear increases with mileage, oil con­sumption will increase again over time until it may be necessary to replace worn compo­nents.
3. Because all these variables play a role, it is not possible to define an oil consumption standard. Therefore, the oil level must be checkerl regularly.
4. If you believe that your engine has increased its oil consumption, contact an authorized Audi dealer or authorized Audi Service Fa­cility to determine the cause. Please note that an exact oil consumption measurement must be done with the necessary care and accuracy and may take time. An authorized Audi dealer or authorized Audi Service Facility is trained in accurately measuring the oil consumption.
5. You can find inforrmation on engine oil and engine oil capacities for the USA at www. audiusa.com/help/maintenance, or for Can­ada at www.audi.ca/ca/web/en/ customer-area/care-and-maintenance/ audi-service-schedules.html, or call 800-822-2834.

Adding engine oil

Observe the safety precautions, Gen­eral information.

1. Turn the engine off.
2. Open the hood.
3. Unscrew the cap for the engine oil filler opening.
4. Carefully add 0.5 quart (0.5 liter} of the correct oil.
5. Close the engine oil filler opening cap.
6. Close the hood.
7. Restart the ignition after two minutes and check the current oil level in the MMI, Checking the engine oil level.
8. Applies to: using engine oil that meets the rec­ommended specification: Add some more en­gine oil again if necessary.

WARNING

1. When adding oil, do not let oil drip onto hot engine components. This increases the risk of afire.
2. You must close the cap on the oil filler open­ing correctly so that oil does not leak out on­to the hot engine and exhaust system when the engin is running, because this is a fire hazard.
3. Always clean skin thoroughly if it comes into contact with engine oil.
4. Engine oil is poisonous and must be kept out of reach of children.
5. Store the engine oil securely in the original container.

NOTE

1. Only use high-grade engine oil that explicit­ly meets the Audi oil quality standard for your vehicle. Using another oil may cause severe vehicle damage.
2. Do not mix any additives with the engine oil. Additives may cause engine damage that is not covered by your New Vehicle limited Warranty.

For the sake of the environment

1. Oil should never enter the sewer system or come into contact with the ground.
2. Follow the legal regulations in the country where you are located when disposing of empty oil containers.

Changing engine oil
Audi recommends having the oil changed at an authorized Audi dealer an authorized Audi Serv­ice Facility. Observe the safety precautions, Gen­eral information.
The engine oil must be changed at the intervals specified in the Warranty & Maintenance Book­let. This is very important because the lubrication function of the oil gradually declines during regu­lar vehicle operation. The engine oil should be changed more frequent­ly under certain circumstances. Have the oil changed more frequently if you often drive short distances, your vehicle is predominantly in stop­andgo traffic situations, is in very dusty environ­ments, or is operated for long periods of time in temperatures below zero. Cleansing additives in the oil make fresh oil ap­pear darker after the engine has run briefly. This is normal and no reason to change the engine oil more frequently than recommended. Because correctly disposing of engine oil is diffi­cult and special tools and technical knowledge are needed for an oil change, Audi recommends having your engine oil changed by an authorized Audi dealer or authorized Audi Service Facility. If you change the engine oil yourself, please note the following important information:

WARNING
If you change the engine oil on the vehicle yourself, the following precautions must be followed:

1. Wear protective eyewear.
2. Due to the risk of scalding, allow the engine to cool down sufficiently.
3. Maintain enough distance when you are re­moving the oil drain plug. While doing this, keep your forearm parallel to the ground to reduce the risk of hot oil dripping down your arm.
4. Drain the oil into a container designed for this purpose that is large enough to hold the full amount of oil in your engine.
5. Engine oil is poisonous. Always store out of reach of children.
6. Prolonged contact of used engine oil with the skin may cause skin damage. Always wash oil off immediately with soap and wa­ter to protect your skin.

NOTE

1. Do not mix any additives with the engine oil. Additives may cause engine damage that is not covered by your New Vehicle limited War­ranty.

For the sake of the environment

1. Before changing the engine oil, make sure you can dispose of the used engine oil cor­rectly.
2. Engine oil must always be disposed of cor­rectly. Do not dump it in the yard, in the for­est, or in open water, river channels, or sew­ers.
3. Have your used engine oil recycled by bring­ing it to a used oil collection site or contact a gas station.

Cooling system

Coolant
The engine cooling system is filled with a mixture of purified water and coolant additive at the fac­tory. This coolant must not be not changed.
The coolant level is monitored using the indi­cator light. However, you should occasionally check the coolant level.

Messages
The following messages may appear depending on the vehicle equipment:
Turn off engine and check coolant level. See owner’s manual

The coolant level is too low
Do not continue driving and switch the ignition off. Check the coolant level.

1. If the coolant level is too low, add coolant. Only continue driving once the in­dicator light turns off.

Coolant temperature: too high. Please let engine run while vehicle is stationary
Let the engine run at idle for a few minutes to cool off, until the indicator light turns off.

1. If the indicator light does not turn off, do not continue driving the vehicle. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

Coolant system: malfunction! Please turn off engine
Do not continue driving, shut the engine off, and switch the ignition off. See an authorized Audi dealer or authorized Audi Service Facility for as­sistance.

Coolant additive
The coolant additive is made of anti-freezing and corrosion protection agents. Only add the follow­ing coolant additives mixed with distilled water.

The amount of coolant additive that needs to be mixed with water depends on the climate where the vehicle will be operated. If the coolant addi­tive percentage is too low, the coolant can freeze and damage the engine.

	Coolant additive	Freeze protection
Warm              min.40% regions            max. 45%		min.-13 °F (-25 °0
Cold                min. 50% regions            max. 55%		max. -40 °F (-40 °0

NOTE

1. Before the start of winter, have an author­ized Audi dealer or authorized Audi Service Facility check if the coolant additive in your vehicle matches the percentage appropriate for the climate. This is especially important when driving in colder climates.
2. If the Gl 2evo coolant additive is not availa­ble in an emergency, do not add any other additive. You could damage the engine. If this happens, only use distilled water and restore the correct mixture ratio with the specified coolant additive as soon as possi­ble.
3. Only refill with new coolant.
4. Radiator sealant must not be mixed with the coolant.
5. You can continue driving if the permitted G 12evo coolant additive was not added. However, go to an authorized Audi dealer or authorized Audi Service Facility immediately to have the coolant replaced to reduce the risk of engine damage.
6. Due to the risk of engine damage, the cool­ing system should only be refilled by an au­thorized Audi dealer or authorized Audi Service Fac1lity. An authorized Audi dealer or authorized Audi Service Facility can also pro­vide you with important information about the recommended coolant additive.

Checking coolant

Observe the safety precautions, Gen­eral information.

Checking the coolant level

1. Park the vehicle on a level surface.
2. Switch the ignition off.
3. Open the hood.

The coolant expansion tank for some engines is located in the water drip tray under a cover. If necessary, remove the cover that is located under the windshield wiper on the front passenger’s side.

1. Check the coolant level in the coolant expan­sion tank. 157 using the outer markings. The coolant level must be between the markings Cy when the engine is cold. When the engine is warm it can be slight­ly above the upper marking.
2. Applies to: vehicles with 6-cylinder engine: There is a float located in the coolant expansion tank. Read the coolant level using the coolant level float. When the engine is cold, the float must be located between the MIN marking and the edge of the filler opening on the coolant ex­pansion tank.
3. When you add coolant to the expansion tank, please refer to, Cooling system.

Adding coolant
Requirement: there must be a residual amount of coolant in the expansion tank.
If you must add coolant, use a mixture of water and coolant additive. Audi recommends mixing the coolant additive with distilled water.

1. Allow the engine to cool.
2. Place a large, thick towel on the coolant expan­sion tank cap.
3. Push the release button on the cap and carefully turn it to the left until you feel resistance
4. Push the release button again and remove the cap completely.
5. Add coolant in the correct mixture ratio  up to the MAX marking. Or, in vehicles with a 6-cylinder gasoline engine, the float must be located between the MIN mark­ing and the edge of the filler opening on the coolant expansion tank.
6. Make sure that the fluid level remains stable. Add more coolant if necessary.
7. Vehicles with 6-cylinder engine: if necessary, press the float into the coolant expansion tank using the cover.
8. Turn the cap to the right to tighten it until you feel resistance a second time.

Coolant loss usually indicates that there is a leak. Immediately drive your vehicle to an authorized Audi dealer or authorized Audi Service Facility and have the cooling system inspected. If the cooling system is not leaking, coolant loss can re­sult from the coolant boiling due overheating and then being forced out of the cooling system.

WARNING

1. The engine compartment in any vehicle is a potentially dangerous area. Stop the engine, switch the ignition off, and allow the engine to cool before working in the engine com­partment. Always follow the information found in, General information.
2. Never open the hood if you can see or hear steam or coolant escaping from the engine compartment. This increases the risk of burns. The cooling system is under pressure. When you no longer see or hear steam or coolant escaping, you may open the engine compartment with caution.
3. When working in the engine compartment, remember that the radiator fan can switch on even ff the ignition is switched off, which increases the risk of injury.
4. Coolant additive and coolant can be danger­ous to your health. For this reason, store the coolant in the original container and away from children. There is a risk of poisoning.

NOTE
Do not continue driving ff the coolant expan­sion tank is empty. Do not add any coolant, because air could enter the cooling system and damage the engine. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

Brake fluid

Observe the safety precautions, Gen­eral information.

Checking the brake fluid level
The brake fluid reservoir is located under a cover on the driver’s side.

1. Park the vehicle on a level surface.
2. Lift the cover at both openings and remove it.
3. Read the brake fluid level on the brake flu id reservoir. The brake fluid level must be between the MIN and MAX mark­ings.

The brake fluid level is monitored automatically.

Messages
The following messages may appear depending on the vehicle equipment:
Stop the vehicle and check the brake fluid level. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

Changing the brake fluid
Brake fluid should be changed at regular inter­vals. Have the brake fluid changed by an author­ized Audi dealer or authorized Audi Service Facili­ty. The authorized Audi dealer or authorized Audi Service Facility will inform you of the replace­ment intervals.

WARNING

1. If the brake fluid level is below the MIN marking, it can impair the braking effect and driving safety, which increase the risk ohm accident. Do not continue driving. See an au­thorized Audi dealer or authorized Audi Service Facility for assistance.
2. If the brake fluid is old, bubbles may form in the brake system during heavy braking. This could impair braking performance and driv­ing safety, which increases the risk of an ac­cident.
3. The brake fluid in your vehicle must meet the standard VW 501 14 and is available at an authorized Audi dealer or authorized Audi Service Facility. If this brake fluid is not available, another high-grade brake fluid of equivalent quality may be used, and it must meet the U.S. Federal Motor Vehicle Stand­ard (FMVSS) 116 DOT 4, Class 6.
4. Reusing brake fluid or using brake fluid that is not permitted for your vehide will signifi­cantly impair the braking performance and can even lead to a failure of the brake sys­tem. The manufacturer of the vehicle is not liable for failures or damage resulting from this. It will also not be covered by the war­ranty.

NOTE 

1. If the brake fluid level is above the MAX marking, brake fluid may leak out over the edge of the reservoir and result in damage to the vehicle.
2. Do not allow any brake fluid to come into contact with the vehicle paint, because it will corrode the paint.

Electrical system

The following messages may appear depending on the vehicle equipment:
If the indicator light turns on, there is a malfunction in the power supply, the battery, or the vehicle electrical system.

Electrical system: malfunction! Safely stop vehicle
Safely stop your vehicle, do not continue driving and switch the ignition off. See an author­ized Audi dealer or authorized Audi Service Facili­ty for assistance.

Electrical system: malfunction! Restart not possible. Please contact Service
If you switch the ignition off, you will not be able to restart the vehicle. Vehicle functions or driving stability may be limited. Drive to an authorized Audi dealer or authorized Audi Service Facility im­mediately.

Electrical system: malfunction! Please con· tact Service
Switch off all electrical equipment that is not needed. If necessary, some equipment will be switched off automatically. Vehicle functions or driving stability may be limited. Drive to an au­thorized Audi dealer or authorized Audi Service Facility immediately.

Electrical system: low battery charge. Bat­tery will be charged while driving

The starting ability may be impaired.

1. If this message turns off after a little while, the vehicle battery has charged enough while driv­ing.
2. If the message does not turn off, drive immedi­ately to an authorized Audi dealer or authorized Audi Service Facility to have the malfunction repaired.

WARNING
When there is an electrical system malfunc­tion, vehicle functions may not work and driv­ing stability may be limited, which increases the risk of an accident. Do not continue driv­ing and switch the ignition off. See an author­ized Audi dealer or authorized Aucli Service Fa­cility for assistance.

Battery

Battery general information
Because of the complex power supply, all work on batteries such as disconnecting, replacing, etc., should only be performed by an authorized Audi dealer or authorized Audi Service Facility Q,&..
Multiple batteries with different technologies may be installed in your vehicle:

1. Vehicle battery (for example, for starting the engine, basic power supply), Safety precautions
2. Auxiliary battery (for example, for recuperation or optional equipment), Safety pre­cautions

Not running the vehicle for long periods of time
The battery will gradually drain if the vehicle does not run for long periods of time. To ensure that the vehicle can still be started, the electrical equipment will be limited or switched off. Some convenience functions, such as interior lighting or power seat adjustment, may not be available under certain circumstances. The convenience functions will be available again when you start the engine.
Even when electrical equipment is switched off, the equipment can still drain the battery if the vehicle is not driven for long periods of time. Deep draining results in a chemical reaction that destroys the inside of the battery. The battery must be charged every month to prevent this. Contact an authorized Audi dealer or authorized Audi Service Facility for more infor­mation.

Winter operation
Cold weather places an especially high load on the 1 2 volt vehicle battery. Have the battery checked by an authorized Audi dealer or author­ized Audi Service Facility before cold weather be­gins.

Replacing the battery
All work on the battery must only be performed by an authorized Audi dealer or authorized Audi Service Facility.
The 1 2 volt vehicle battery was developed based on the installation location and is equipped with safety features. If a 12 volt vehicle battery must be replaced, ask your authorized Audi dealer or authorized Audi Service Facility about the electro­magnetic compatibility, size, and the necessary maintenance, power, and safety standards for the new 12 volt vehicle battery. The battery vent of the 1 2 volt vehicle battery must always be on the negative terminal side. The battery vent on the positive terminal side must always be closed. When replacing the 12 volt lead-acid vehicle bat­tery, only use a maintenance-free 12 volt lead­acid battery that conforms to the TL 82S 06 and VW 7 SO 73 standards. These standards must be from October 2014 or newer.

WARNING

1. ALL work on the battery or electrical system in your vehicle can result in injuries, chemi­cal burns, accidents, or burns. Because of this, all work must be performed only by an authorized Audi dealer or authorized Audi Service Facility.
2. Always have an authorized Audi dealer or authorized Audi Service Facility replace the 12 volt vehicle battery, because and adapta­tion must be performed on the vehicle elec­trical system when the battery is replaced. Only an authorized Audi dealer or author­ized Audi Service Facility has the necessary technology to perform the adaption correct­ly. Otherwise, there could be a loss of safe­ty-related functions among other things, which increases the risk of an accident.
3. Never connect a charging cable or jump start cable directly to the 12 volt vehicle battery. Only use the connections in the en­gine compartment.

WARNING
California Proposition 65 Warning:
Battery posts, terminals and related acces­sories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harms. Wash hands after handling.

NOTE

1. If the vehicle will be parked for long periods of time, protect the battery against the cold so that it will not be destroyed by “freezing” Q page 236, Charging the 12 volt vehicle battery.
2. There are electrical components under the cargo floor behind a trim panel that warm up during operation. To reduce the risk of the components overheating, do not store objects such as blankets under the cargo floor. If the components overheat, they will switch off temporarily. This will be indicated by a message that will be displayed in the instrument cluster until the temperature re­turns to normal.
3. Always have an authorized Audi dealer or authorized Audi Service Facility replace the 12 volt vehicle battery, because and adapta­tion must be performed on the vehicle elec­trical system when the battery is replaced. Only an authorized Audi dealer or author­ized Audi Service Facility has the necessary technology to perform the adaption correct­ly.
4. Using unsuitable batteries may void the ve­hicle’s operating license.

For the sake of the environment
Batteries must be disposed of using methods that will not harm the environment. Do net dispose of them in household trash. They contain harmful substances and recycla­ble raw materials. Contact an authorized Audi dealer or authorized Audi Service Facility for more information.

Safety precautions
Explanation of warning symbols:

	Observe all warnings – there is a risk for in- jury! Always follow the instructions in the oper- ating manual. Electrolyte fluid is highly corrosive. Always wear protective gloves and eye protection. First aid: if electrolyte fluid enters the eyes, immediately flush with clean water for several minutes. Seek medical atten- tion immediately. Immediately neutralize electrolyte fluid on the skin or clothing us- ing a soap solution and rinse with plenty of water. If electrolyte fluid is accidentally ingested, seek medical attention immedlately.
	Always wear eye protection.
	If electrolyte fluid enters the eyes, imme- diately flush with clean water for several minutes. Seek medical attention immediately.
	Fire, sparks, open flame, and smoking are prohibited. Avoid creation of sparks and short circuits when handling cables and electrical devices.
	Always keep children away from battery electrolyte fluid and the battery.
	A highly explosive mixture of gases can form when charging batteries.

WARNING
All work on the batteries must only be per­formed by an authorized Audi dealer or au­thorized Audi Service Facility.

1. Gases that escape from these batteries can be poisonous or flammable.
2. The contents of these batteries can be corro­sive. If any battery contents come into con­tact with the skin, flush the affected area for at least 15 minutes with clean water. Then wash the affected area with soap. Have the affected area examined by a medical profes­sional.

NOTE

1. Components must not be connected to the battery terminals and wires on the 48 volt battery because this increases the risk of damage, for example due to overvoltage.
2. Have maintenance work performed only by trained personnel.
3. Have the 48 volt lithium battery replaced only by an authorized Audi dealer or author­ized Audi Service Facility. Audi recommends an authorized Audi dealer or authorized Audi Service Facility, because these loca­tions have trained personnel and the re­quired parts and tools.
4. Never try to replace the 48 volt lithium bat­tery yourself. The 48 volt Lithium battery in this vehicle may only be replaced with a 48 volt lithium battery designed by Audi specif­ically for this vehicle. Using other 48 volt lithium or lead batteries will result in con­siderable malfunctions or even total failure of the electrical system.
5. Never make modifications to the lithium battery.
6. Never open the 48 volt battery.

Charging the 12 volt vehicle battery

Observe the safety precautions, Gen­eral information, QA in Battery general infor­mation,
Requirement: only use chargers with a maximum charging current of 14.8 volts. The battery ca­bles remain connected.
The charging cable connections are located in the engine compartment. The ground point 0 is al­ways located on the vehicle body.

1. Switch off the ignition and all electrical equip­ment.
2. Open the hood.
3. Press the release lever on the positive terminal and fold the cover upward.
4. Clamp the terminal clamps on the charger correctly onto the positive terminal 0 and the ground point 0-
5. Insert the power cable for the charger into the socket and switch the charger on.
6. At the end of the charging process, switch the charger off and pull the power cable out of the socket.
7. Remove the charger terminal clamps.
8. Close the cover on the positive terminal.
9. Close the hood.

WARNING

1. Never connect a charging cable or jump start cable directly to the 12 volt vehicle battery. Only use the connections in the en­gine compartment
2. A highly explosive mixture of gases can form when charging batteries. Only charge the battery in well-ventilated areas.
3. A drained battery can freeze at tempera­tures around 32 °F (0 °C). Do not charge or use a frozen or thawed battery. if ice forms, the battery housing can crack and battery electrolyte fluid can leak, which increases the risk of an explosion and chemical burns. Contact an -authorized Audi dealer or author­ized Audi Service Facility for more informa­tion.
4. Do not connect or disconnect the charging cable while charging because this increases the risk of an explosion.

TIPS
Read all of the manufacturer’s instructions for the charger before charging the battery.

FAQs

Useful Link

View Full User Guide: 2023 Audi A4 Owner’s Manual
2023 Audi A4 Lights and Wipers