12 12 011 Replacing all spark plugs (N42, N40, N46, N45, N52, N52K, N51)

Special tools required: 

See 12 ENGINE ELECTRICAL SYSTEM .

• 12 1 171 
• 12 1 200 

Necessary preliminary tasks: 

• Switch off ignition
• Remove ignition coils, see 12 13 511 Replacing ignition coils (N52, N52K, N51) .

Unscrew spark plugs with special tool 12 1 171. 

Installation: 

Tighten down spark plugs with special tool 12 1 171  and special tool 12 1 200  (torque limiter).

Without special tool 12 1 200  , observe tightening torque.

Tightening torque: 12 12 1AZ, see 12 12 SPARK PLUGS .

Fig 1: Special Tool 12 1 171 And 12 1 200

Courtesy of BMW OF NORTH AMERICA, INC.