A new reference value needs to be stored when certain changes have been made, such as every time you adjust the tire pressure or change the wheels. The reference value may also need to be updated when there is a significant change in the vehicle's weight due to loading or unloading.
Warning
The exhaust gases contain carbon monoxide, which is invisible and odorless, but highly toxic. The procedure to save a new tire pressure must therefore always be performed outdoors or in a workshop with exhaust extraction.
Turn the vehicle off.
Inflate the tires to the correct tire pressure.1
Start the vehicle.
Press the app library symbol 
in the bottom bar and go to Status.
in the bottom bar and go to Status.Select Update reference pressure.
Note
The Update reference pressure button is used to save a new reference value for the tire pressure monitoring system. For safety reasons, you can only make updates when the vehicle is turned on and stationary.
Adjust the tire pressure to the recommended values and save the new tire pressure. The confirmation step helps prevent changing the new reference value by mistake.
Start driving the vehicle. The new value will be stored after driving for several minutes at a speed above 35 km/h (22 mph).
- Once a new reference value is saved, the animation showing the saving progress disappears from the center display.
- If saving fails, an error message is shown.