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 171an
Safety information
Warning
Removal or incorrect adjustment of head restraints
can cause injuries in the head and neck
area. There is a risk of injury.
Before driving, install the removed head
restraints on the occupied seats.
Adjust the head restraint so its center supports
the back of the head