Special tools required:

• 12 1 171
• 12 1 172

Necessary preliminary tasks: 

• Switch off ignition.
• Remove all ignition coils. See Replacing ignition coil (N62) .

Unscrew spark plugs with special tool 12 1 171.

Installation: 

1. Tighten down spark plugs with special tool 12 1 171 and special tool 12 1 172 (torque limiter).
2. Without special tool 12 1 172, observe tightening torque. See ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .
3. Tightening torque, see ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .
   Fig 1: Removing Spark Plugs With Special Tool

   Courtesy of BMW OF NORTH AMERICA, INC.