12 12 011 Replacing all spark plugs (N52K)

Necessary preliminary work: 

• Switch off ignition.
• Remove IGNITION COILS  .

Clean spark connector slot with compressed air.

Unscrew spark plugs with special tool 12 1 171 and an extension with a joint.

Installation note: 

First, hand-thighten the spark plugs with special tool 12 1 171 and with an extension with a joint into the engine.

Then tighten the spark plugs using a torque wrench, special tool 12 1 171 and an extension with a joint.

Observe tightening torque.

Tightening torque 12 12 2AZ .

Fig 1: Removing Spark Plug Using Special Tool (12 1 171)

Courtesy of BMW OF NORTH AMERICA, INC.