Replacing All Spark Plugs
Replacing All Spark Plugs (N62)
Switch off ignition.
Remove ignition coils.
Unscrew spark plugs with special tool 12 1 171.
Installation:
Tighten down spark plugs with special tool 12 1 171 and special tool 12 1 172 (torque limiter).
Observe tightening torque without special tool 12 1 172.
Tightening torque, Spark plugs (ungreased).