See also:

2011 Mercedes-Benz CL-Class Review
The 2011 Mercedes-Benz CL550 is stunning — both to look at and to drive — in a way not many cars are. The CL550 is plenty quick, though it's not at the top of the CL-Class heap in terms of power ...

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 () in the ignition lock. On vehicles with KEYLESS-GO, press ...

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 ...