1212011 Replace all spark plugs (N40, N42, N45, N45T, N46, N46T, N51, N52, N52K): Notes

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work:

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.

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.