See also:

Mounting a new wheel
WARNING Always replace wheel bolts that are damaged or rusted. Never apply oil or grease to wheel bolts. Damaged wheel hub threads should be repaired immediately. Do not continue to dri ...

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. - ...

Cleaning genuine wood and trim elements
  Wipe the wooden trim and trim pieces with a damp, lint-free cloth, e.g. a microfiber cloth.   Heavy soiling: use car care and cleaning products recommended and approved by Mercede ...