Smart Key battery

See also:

Safety
As it should be, the M-Class is full of standard safety features like an electronic stability system, antilock brakes, traction control, side curtain airbags, and side-impact airbags for the front ...

Automatic engine start
The engine is started automatically if you:  - release the brake pedal when HOLD is not activated and the transmission is in position D or N  - shift the transmission to position R ...

Fuel filler flap
The fuel filler flap is unlocked or locked automatically when you open or close the vehicle with the SmartKey or using KEYLESSGO. The position of the fuel filler cap is displayed in the instrument ...