Mercedes-Benz A-CLASS SEDAN 2020 Tire Pressure User Manual
Introduction
Welcome to the Mercedes-Benz world, where performance and innovation meet luxury. The magnificent 2020 Mercedes-Benz A-Class Sedan, a real expression of elegance and engineering superiority, is in the limelight today. One of its many cutting-edge features, the rigorous attention to detail when it comes to tire pressure, guarantees a comfortable and secure ride. The 2020 Mercedes-Benz A-Class Sedan’s tire pressure monitoring system does more than just keep track of inflation. It is an advanced and clever configuration made to enhance your driving experience. Maintaining the correct tire pressure is essential for the best performance, fuel economy, and overall safety whether you’re taking on a daring adventure or navigating city streets.
The A-Class Sedan’s tire pressure management system continuously monitors the air pressure in each tire and updates the driver via the user-friendly dashboard display in real time. You’ll be instantly informed if any tire deviates from the advised pressure range, enabling you to take prompt action to preserve top performance and stay clear of possible hazards. The tire pressure system is just one example of how meticulous and luxurious Mercedes-Benz engineers went to great lengths to create an automobile. So, unwind, enjoy the journey, and rest certain that your Mercedes-Benz A-Class Sedan 2020 has been meticulously designed to give you a premium driving experience unlike any other.
Tire pressure
Notes on tire pressure
WARNING
Risk of accident due to insufficient or excessive tire pressure
Underinflated or overinflated tires pose the following risks:
- The tires may burst, especially as the load and vehicle speed increase.
- The tires may wear excessively and/or unevenly, which may greatly impair tire traction.
- The driving characteristics, as well as steering and braking, may be greatly impaired.
- Comply with the recommended tire pressure and check the tire pressure of all tires including the spare wheel regularly:
- at least once a month
- when the load changes
- before embarking on a longer journey
- if operating conditions change, e.g. off-road driving
- Adjust the tire pressure as necessary.
Tire pressure which is too high or too low can:
- Shorten the service life of the tires.
- Cause increased tire damage.
- Adversely affect driving characteristics and thus driving safety, e.g. due to hydroplaning.
WARNING
Risk of an accident due to insufficient tire pressure
Tires with pressure that is too low can over‐heat and burst as a result.
In addition, they also suffer from excessive and/or irregular wear, which can significantly impair the braking properties and the han‐dling characteristics.
- Avoid excessively low tire pressures in all the tires, including the spare wheel.
Tire pressure which is too low can cause:
- Tire defects as a result of overheating.
- Impaired handling characteristics.
- Irregular wear.
- Increased fuel consumption.
WARNING
Risk of accident from exces‐ sive tire pressure
Tires with excessively high pressure can burst because they are damaged more easily by highway fill, pot holes etc.
In addition, they also suffer from irregular wear, which can significantly impair the brak‐ing properties and the handling characteris‐tics.
- Avoid excessively high tire pressures in all the tires, including the spare wheel.
Tire pressure which is too high can cause:
- Increased braking distance.
- Impaired handling characteristics.
- Irregular wear.
- Impaired driving comfort.
- Susceptibility to damage.
WARNING
Risk of accident caused by repeated drop in tire pressure
If the tire pressure drops repeatedly, the wheel, valve or tire may be damaged.
Insufficient tire pressure can cause the tires to burst.
- Inspect the tire for signs of foreign objects.
- Check whether the wheel or valve has a leak.
- If you are unable to rectify the damage, contact a qualified specialist workshop.
You can find information on tire pressure for the vehicle’s factory-installed tires on the following labels:
- Tire and Loading Information placard on the B‑pillar of your vehicle.
- Tire pressure table on the inside of the fuel filler flap.
- Observe the maximum tire pressure.
Use a suitable pressure gauge to check the tire pressure. The outer appearance of a tire does not permit any reliable conclusion about the tire pressure.
Vehicles with a tire pressure monitoring system:
You can also check the tire pressure using the on-board computer.
Only correct tire pressure when the tires are cold. Conditions for cold tires:
- The vehicle has been parked with the tires
out of direct sunlight for at least three hours. - The vehicle has traveled less than 1 mile (1.6 km).
A rise in the tire temperature of 18 °F (10 °C) increases the tire pressure by approx. 10 kPa (0.1 bar/1.5 psi). Take this into account when checking the tire pressure of warm tires.
The tire pressure recommended for increased load/speed in the tire pressure table can affect the ride comfort.
WARNING
Risk of accident due to unsuitable accessories on tire valve
If you mount unsuitable accessories onto tire valves, the tire valves may be overloaded and malfunction, which can cause a loss of tire pressure. Aftermarket tire pressure monitor‐ing systems will cause the tire valve to remain open, depending on the design. This can also result in a loss of tire pressure. Only screw standard valve caps or valve caps specifically approved by Mercedes-Benz for your vehicle onto the tire valve.
Tire pressure table
The tire pressure table is on the inside of the fuel filler flap.
The data shown in the images is example data.
The tire pressure table shows the recommended tire pressure for all tires approved for this vehi‐cle. The recommended tire pressures apply for cold tires under various operating conditions, i.e. loading and/or speed of the vehicle. If one or more tire sizes precede a tire pressure, the tire pressure information following is only valid for those tire sizes.
The load conditions “partially laden” and “fully laden” are defined in the table for different num‐bers of passengers and amounts of luggage. The actual number of seats may differ from this.
Some tire pressure tables only show the rim diameter instead of the complete tire size, e.g. R18. The rim diameter is part of the tire size and can be found on the tire side wall.
Be sure to also observe the following further related subjects:
- Notes on tire pressure
- Tire and Loading Information placard
- Maximum tire pressure
Checking tire pressures manually
- Read the tire pressure for the current operating conditions from the Tire and Loading Information placard or the tire pressure table. Observe the notes on tire pressure.
- Remove the valve cap of the tire to be checked.
- Press the tire pressure gauge securely onto the valve.
- Read the tire pressure.
- If the tire pressure is lower than the recommended value, increase the tire pressure to the recommended value.
- If the tire pressure is higher than the recommended value, release air. To do so, press down the metal pin in the valve, e.g. using the tip of a pen for example. Then check the tire pressure again using the tire pressure gauge.
- Screw the valve cap onto the valve.
Further related subjects:
- Notes on tire pressure
- Tire pressure table
- Tire and Loading Information placard
Tire pressure monitoring system
Function of the tire pressure monitoring sys‐tem
DANGER
Risk of accident due to incorrect tire pressure
Each tire, including the spare tire (if present), should be checked at least once a month when cold and then inflated to the pressure recommended by the vehicle manufacturer (see the Tire and Loading Information plac‐ard on the driver’s side B‑pillar or the tire pressure table on the inside of the fuel filler flap of your vehicle). If your vehicle has tires of a different size than the size indicated on the Tire and Loading Information placard or the tire pressure table, you must find out the correct tire pressures for these tires.
As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pressure indicator lamp when one or more of your tires are significantly underinflated. Accordingly, if the low tire pressure indicator lamp lights up, you should stop and check your tires as soon as possible, and inflate them to the correct pressure. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also increases fuel consumption, reduces the life expectancy of the tire, and may adversely affect the handling and braking characteristics of the vehicle. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver’s responsibility to maintain correct tire pressure, even if underinflation has not reached the level to trigger illumination of the TPMS low tire pressure indicator lamp.
Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure indicator lamp. When the system detects a malfunction, the indicator lamp will flash for approximately a minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of incompatible replacement or alternate tires or wheels on the vehicle that prevents the TPMS from functioning properly. Always check the TPMS malfunction warning lamp after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.
The system checks the tire pressure and the tire temperature of the tires installed on the vehicle by means of a tire pressure sensor.
New tire pressure sensors, e.g. in winter tires, are automatically taught in during the first journey they are used. The tire pressure and the tire temperature appear in the multifunction display.
If there is a substantial pressure loss or if the tire temperature is excessive, you will be warned in the following ways:
- Via display messages
- Via the warning lamp in the instrument cluster
The tire pressure monitoring system is only an aid. It is the driver’s responsibility to set the tire pressure to the recommended cold tire pressure suitable for the operating situation. Set the tire pressure for cold tires using a tire pressure gauge. Note that the correct tire pressure for the current operating situation must first be taught-in to the tire pressure monitoring system. In most cases, the tire pressure monitoring system will automatically update the new reference values after you have changed the tire pressure. You can, however, also update the reference values by restarting the tire pressure monitoring system manually.
System limits
The system may be impaired or may not function in the following situations:
- The tire pressure has been set incorrectly
- There is a sudden pressure loss caused, for example, by a foreign object penetrating the tire
- There is a malfunction caused by another radio signal source
Be sure to also pay attention to the following related topic: - Notes on tire pressure
One of the following displays appears:
- Current tire pressure and tire temperature of the individual wheels:
- Tire pressure will be displayed after driving for a few minutes
- Tire Pressure Monitor Active: the teach-in process of the system is not yet complete.
The tire pressures are already being monitored. - Compare the tire pressure with the recommended tire pressure for the current operating condition. Observe the notes on tire temperature.
The values displayed in the multifunction display may deviate from those of the tire pressure gauge as they refer to sea level. At high altitudes, the tire pressure value indicated by a pressure gauge are higher than those shown by the onboard computer. In this case, do not reduce the tire pressure.
Make sure to observe the following further related subject:
- Notes on tire pressure
Restarting the tire pressure monitoring system
Requirements:
- The recommended tire pressure is correctly set for the respective operating status on each of the four wheels.
Restart the tire pressure monitoring system in the following situations:
- The tire pressure has changed.
- The wheels or tires have been changed or are newly installed.
On-board computer:
- Swipe downwards on Touch Control on the left-hand side of the steering wheel.
The Use Current Pressures as New Reference Values message is shown in the multi‐function display. - To begin restart, press Touch Control on the left-hand side of the steering wheel.
The Tire Press. Monitor Restarted message is shown in the multifunction display. Current warning messages are deleted and the yellow
warning lamp goes out.
After you have been driving for a few minutes, the system checks whether the current tire pressures are within the specified range. The current tire pressures are then accepted as reference values and monitored.
Make sure to observe the following further related subject:
- Notes on tire pressure
Radio-equipment approval of the tire pressure monitoring system
Radio equipment approval numbers
| Country | Radio type approval number |
| Canada | IC: 4008C-TSSRE4A |
| USA | FCC ID: YGOTSSRE4A |
Further information on the declaration of conformity for wireless vehicle components.
Tire pressure loss warning system
The function of the tire pressure loss warning system
The tire pressure loss warning system warns the driver by means of display messages when there is a severe tire pressure loss. After a change in tire pressure, a wheel rotation or a tire change, or if you have re-installed wheels or tires, the tire pressure loss warning system has to be restarted. The tire pressure loss warning system does not replace the need to regularly check the tire pressure.
System limitations
The system may be impaired or may not function particularly in the following situations:
- Incorrectly set tire pressure
- Sudden pressure loss caused, for example, by a foreign object penetrating the tire
- Steady pressure loss in several tires
The system has a restricted or delayed function, particularly in the following situations:
- Poor ground conditions, e.g. snow or gravel
- Driving with snow chains
- When adopting a very sporty driving style with high cornering speeds or sudden acceleration
- Driving with a high load
Be sure to also observe the following further related subjects:
- Notes on tire pressure
- Display messages about the tires
Restarting the tire pressure loss warning system
Requirements:
- The recommended tire pressure is correctly set for the respective operating status on each of the four wheels.
Restart the tire pressure loss warning system in the following situations:
- The tire pressure has changed.
- The wheels or tires have been changed or are newly installed.
- Swipe downwards on Touch Control on the left-hand side of the steering wheel.
The Tire Pressure Control System Active Restart message is shown in the multifunction display.
Restart the tire pressure loss warning system in the following situations:
- The tire pressure has changed.
- The wheels or tires have been changed or are newly installed.
- To begin restart, press Touch Control on the left-hand side of the steering wheel.
The Tire Pressure Now OK? the message is shown in the multifunction display. - Select Yes.
- To confirm restart, press Touch Control on the left-hand side of the steering wheel. The Run Flat Indicator Restarted message is shown in the multifunction display.
After you have driven for a few minutes, the tire pressure loss warning system monitors the set tire pressure of all the tires.
Be sure to also observe the following further related subjects:
- Notes on tire pressure
FAQs
The manufacturer normally specifies the Mercedes-Benz A-Class Sedan 2020’s recommended tire pressure in the owner’s manual or on a label inside the driver’s door frame.
The owner’s handbook, the driver’s side door frame, or the gasoline filler flap are all places where you can find the recommended tire pressure for your 2020 A-Class Sedan.
The A-Class Sedan 2020’s four tires typically have the same recommended tire pressure. The particular tire pressure for your car must be confirmed, though, as some vehicles may have varying front and rear tire pressures.
A rougher ride, less traction, more wear in the core of the tread, and a higher danger of a blowout can all result from overinflation of the tires.
Reduced fuel efficiency, uneven tire wear, poor handling, and a higher chance of tire failure can all result from underinflated tires.
It is advised to check your A-Class Sedan’s tire pressure at least once each month and before long excursions. Throughout these tests, look for any obvious damage to the tires as well.
No, the tire pressure mentioned on the sidewall of the tire should not be used as the recommended operating pressure for your 2020 A-Class Sedan. Instead, it should be considered the maximum pressure that the tire can withstand.
Check the tire pressures as soon as you can using a dependable pressure gauge if the tire pressure warning light illuminates. As necessary, inflate or deflate the tires to the recommended pressures.
Yes, variations in temperature can cause changes in tire pressure. Tire pressure can drop with a drop in temperature and vice versa. It’s crucial to take these changes into consideration and modify the pressure accordingly.
No, even though the tires seem to be in good condition, it is imperative to check the tire pressure when the warning light illuminates. A progressive pressure drop that might not be visible visually may be indicated by the light.
Although employing nitrogen can have some advantages, such as reduced pressure loss, it is not required. For filling the tires of your 2020 A-Class Sedan, regular air is ideal.
Check tire pressure frequently, rotate the tires as directed by the owner’s handbook, align the wheels when necessary, and look for any signs of wear or damage.
A tire sealant, for example, is not a long-term remedy. To protect your safety and the longevity of the tire, it is essential to get the damaged tire professionally repaired or replaced as soon as possible.
It is advisable to raise the tire pressure to the levels recommended in the owner’s manual when hauling heavy goods to accommodate the extra weight.
Even though the TPMS is a useful tool, routine physical tire pressure checks are still necessary. Although it cannot substitute regular tire care, the TPMS may not be able to detect slow pressure reduction.
Useful Links
Download Manuals: Owner’s Manuals | Mercedes-Benz USA
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