A new reference value needs to be stored when certain changes have been made, such as every time you adjust the tyre pressure or change the wheels. The reference value may also need to be updated when there is a significant change in the car's weight due to loading or unloading.
Warning
The exhaust gases contain carbon monoxide, which is invisible and odourless, but highly toxic. The procedure to save a new tyre pressure must therefore always be performed outdoors or in a workshop with exhaust extraction.
Turn the car off.
Inflate the tyres to the correct tyre pressure.1
Start the car.
Press the app library symbol 
in the bottom bar and go to Car status.
in the bottom bar and go to Car status.Select Update reference pressure.
Note
The Update reference pressure button is used to save a new reference value for the tyre pressure monitoring system. For safety reasons, it's only available when the car is turned on and stationary.
Adjust the tyre pressure to the recommended values and press Confirm to save the new tyre pressure. The confirmation step is needed to avoid saving a new reference value by mistake.
Start driving the car. 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 centre display.
- If saving fails, an error message is shown.