See also:

Checking the coolant level
Only check the coolant level when the vehicle is on a level surface and the engine has cooled down. – Turn the SmartKey to position 2 (Y page 139) in the ignition lock. On vehicles with KEYLES ...

General notes
If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. Check the battery in ...

Activating DISTRONIC PLUS
Activation conditions In order to activate DISTRONIC PLUS, the following conditions must be fulfilled: - the engine must be started. It may take up to two minutes after pulling away before DIS ...