What is the correct tire pressure in the Mercedes Benz C 300?

This blog will answer the following questions: what is the correct tire pressure for the Mercedes Benz C300? What are the different tire pressure monitoring systems in the Mercedes Benz C 300?  How to reset the Tire pressure monitor in the Mercedes Benz C 300?Should you fill the tires with nitrogen instead of air?

What is the correct tire pressure in the Mercedes Benz C 300?

The correct tire pressure in the Mercedes Benz C 300 is given in the table below, it is necessary to maintain the correct tire pressure according to the tire size and load in the vehicle.

The correct tire pressure information is provided in the owner’s manual and on the inside of the fuel filler flap. The tire pressure also changes depending on the speed and load index or tire. Therefore, the tire manufacturers also write the correct tire pressure on the sidewall of the tire.

Mercedes Benz C300 also uses a tire pressure monitoring system and alerts the driver if the tire pressure is not okay. The tire pressure also changes according to the load in the car, if all the occupants with luggage are in the car then the rear wheels need more tire pressure.

Incorrect tire pressure not only reduces the fuel economy but also causes too much wear on the tire tread. Run flat tires can also be installed on the Mercedes Benz C 300, it allows the driver to continue the journey despite a puncture. The car can travel for 50 miles at restricted speeds.

Further information on the tire size for the run-flat tire is available at the Mercedes Benz authorized dealership.

What are the different tire pressure monitoring systems in the Mercedes Benz C 300?

The different tire pressure monitoring systems in the Mercedes Benz C 300 are as follows:

• Run flat indicator

The C 300 model series W204 used the Run-flat indicator system. This function is programmed into the electronic stability program control unit. The wheel speed sensors located on all four wheels are used to monitor the tire pressure.

If a tire has less pressure compared to the other tires, the wheel speed signal deviation of the tire with less pressure will be different from the other tires. When the difference in the wheel speed is too much, the ESP control unit will activate the Run-flat indicator in the instrument cluster.

The Run flat indicator becomes imperative if there is a problem in the wheel speed sensor of the car. The ESP control unit will also not work until the fault is rectified. The Run flat tire pressure monitoring system is not able to display the actual tire pressure on the instrument cluster.

• TPMS

TPMS is present in the C 300 from the 204 facelift model, there are four pressure sensors on each wheel, and the TPMS control unit is located near the rear axle of the car. All four sensors send the current tire pressure data to the TPMS control unit through radio signals.

The pressure sensors are taught in the control unit, the teach-in data contains the wheel localization data. Hence, if a tire rotation is performed the teach-in process of all the sensors must be performed again.

All the pressure sensors have an internal battery that can last very long but a tire pressure monitoring system malfunction light comes on if the battery in the sensor is completely dead. It is not possible to replace the individual batteries in the sensor, a complete sensor is replaced.

Unlike, the run flat indicator system, TPMS can accurately measure and display the current tire pressure. It can also notify the driver which wheel has low tire pressure by showing a ‘rectify tire pressure’ message in the instrument cluster.

• Aftermarket Tire pressure monitor system

If the C 300 only has a run-flat indicator system, the customer can use an aftermarket tire pressure monitor. The aftermarket system consists of 4 sensors like the TPMS but the sensors screw onto the valves of each tire. The control unit also works on an in-built battery so no modifications are required to install the system.

The data from the sensors can be transferred to the control unit via Bluetooth or radio. Most of the control units also come with an inbuilt display to show the actual tire pressure. The advantage of an aftermarket tire pressure monitoring system is its ease of installation. Some of the latest systems even show the specified tire pressure according to the make and model.

The pressure sensors can also be installed inside the wheels with the help of a belt. The sensor sits perfectly in the rim offset and does not get damaged if there is a puncture. It is more secure than the sensor installed on the valve as it is possible to steal the sensor by simply unscrewing it. 

How to reset the Tire pressure monitor in the Mercedes Benz C 300? 

The procedure to reset the tire pressure monitor system is given below.

• Identify the type of tire pressure monitoring system present on the vehicle.
• If the run flat indicator is active, it can be reset by connecting a diagnostic scanner and resetting the warning light. Similarly, if the vehicle is driven for a few meters the warning can also go away on its own.
• If there is a TPMS system in the C 300, then use the multifunction keys on the steering wheel and select the tire pressure menu in the instrument cluster.
• Press the up or down key until the option to reset the tire pressure monitor appears.
• Select OK to reset the tire pressure monitoring system.

There should be no fault codes present in the fault memory of the tire pressure monitoring system. The TPMS must always be reset after checking the tire pressure otherwise the warning will not go away.

Should you fill the tires with nitrogen instead of air?

There is no need to fill the tires with nitrogen, Mercedes Benz does not recommend the use of nitrogen in the tires. Air consists of more than 75 percent of nitrogen and there is no benefit to filling the tires with pure nitrogen. Most of the tire filling stations are also not capable of filling pure nitrogen in the tires. 

Conclusion

This blog listed the correct tire pressure for the Mercedes Benz C300 according to the full and partial load in the vehicle. Check the tire pressure at least once a month to prolong the tire life and TPMS systems also help to keep the tires operating at the correct tire pressure.