REPLACING ALL SPARK PLUGS (N42, N40, N46, N45, N52, N52K, N51)
Special tools required:
12 1 171
12 1 200.
Necessary preliminary tasks:
Switch off ignition
Remove ignition coils.
Unscrew spark plugs with special tool 12 1 171.
Installation:
Tighten down spark plugs with special tool 12 1 171a
Principle
Depending on the equipment and national-market
version, the rear-end collision preparation can
react to vehicles approaching from behind.
General information
Radar sensors monitor the area behind the vehicle.
When a vehicle approaches from the rear at a
certain speed, the system can reac