See also:

Range of the sensors
General notes The sensors must be free of dirt, ice and slush; otherwise they may not function correctly. Clean the sensors regularly, taking care not to scratch or damage them. Side view ...

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. ...

Important notes on tire pressure
WARNING Should the tire pressure drop repeatedly: check the tire for foreign bodies. check whether the wheel is losing air or the valve is leaking. make sure that only a valve cap approv ...