Necessary preliminary work

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Switch off ignition.
Remove IGNITION COILS .

IMPORTANT: Wear safety goggles.
Oil and dirt particles may get into your eyes!

Clean spark plug slot with compressed air.

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

Installation note:

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

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

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

Courtesy of BMW OF NORTH AMERICA, INC.

Observe tightening torque.

Tightening torque 12 12 2AZ .