See also:

Problems with the SmartKey
Problem Possible causes/consequences and  Solutions You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged ...

Problems with your vehicle
If you should experience a problem with your vehicle, particularly one that you believe may affect its safe operation, we urge you to contact an authorized Mercedes-Benz Center immediately to have ...

Restricting the shift range
Press the selector lever to the left towards D–. or Pull the left-hand steering wheel paddle shifter. The automatic transmission shifts down one gear and restricts the shift range to the re ...