See also:

Lights
Display messages about LEDs: This display message will only appear if all LEDs have failed. Display messages   Cornering Lamp Left or Cornering Lamp Right Possible causes/consequences an ...

Cleaning the steering wheel and gear or selector lever
Thoroughly wipe with a damp cloth or use leather care agents that have been recommended and approved by Mercedes- Benz. ...

High outside temperatures
If DEF heats up to over 122 °F (50 °C ) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...