12 12 011 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 1 171 and special tool 12 1 200 (torque limiter).

Without special tool 12 1 200, observe tightening torque.

For tightening torque refer to 12 12 1AZ in 12 12 SPARK PLUGS .

Fig 1: Identifying Special Tool (12 1 171) And Torque Limiter (12 1 200)

Courtesy of BMW OF NORTH AMERICA, INC.