See also:

Locking the vehicle
If the vehicle can no longer be locked with the SmartKey, you can lock it by taking the following steps. If the central locking in the vehicle is malfunctioning, you cannot lock the trunk. P ...

Engine
Problem Possible causes/consequences and •► Solutions The yellow Check Engine warning lamp lights up while the engine is running. There may be a malfunction, for example: ...

Charging the battery
WARNING Never charge a battery still installed in the vehicle unless a battery charger unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosions th ...