See also:

Automatic deactivation during forward travel
The system switches off when a certain driving distance or speed is exceeded. Switch the system back on if necessary. ...

Have diesel exhaust fluid refilled
This exhaust fluid is refilled by your service center during regular maintenance. If you adhere to this maintenance schedule, it is usually not necessary to refill any fluids between the mainten ...

Switching off automatically
The system switches off and the LED goes out: ▷ After approx. 165 ft/50 m when driving forward. ▷ After approx. 22 mph/35 km/h when driving forward. Switch on the system again if nece ...