12 12 011 Replacing All Spark Plugs (N42, N40, N46, N45, N52, N52K, N51)

Special tools required: 

• 12 1 171
• 12 1 200. See 12 1 200 TORQUE LIMITER 30 NM

Necessary preliminary tasks: 

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

Unscrew spark plugs with special tool 12 1 171.

Installation: 

Tighten down spark plugs with special tool 12 1 171and special tool 12 1 200 (torque limiter). See 12 1 200 TORQUE LIMITER 30 NM .

Without special tool 12 1 200, observe tightening torque. See 12 1 200 TORQUE LIMITER 30 NM .

Tightening torque 12 12 1AZ0. See 12 12 SPARK PLUGS

Fig 1: Identifying Special Tool (12 1 171) And (12 1 172)

Courtesy of BMW OF NORTH AMERICA, INC.