See also:

4MATIC (permanent four-wheel drive)
4MATIC ensures that all four wheels are permanently driven. Together with ESP® and 4ETS, it improves the traction of your vehicle whenever a drive wheel spins due to insufficient grip. WARNI ...

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. ...

ATA (Anti-Theft Alarm system)
A visual and audible alarm is triggered if the alarm system is armed and you open: - a door - the vehicle with the mechanical key - the trunk lid/tailgate - the hood The alarm is not s ...