12 14 600 Replacing knock sensor (M52TU, M54, M56)

Necessary preliminary tasks:

Check stored fault messages.
Switch off ignition.
Remove intake air manifold. See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54)

Unclip plug connection (1) from holder of cable duct (2) and disconnect.

Fig 1: Removing Plug Connection From Holder Of Cable Duct

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) and remove knock sensor for cylinder bank 1-3.

Fig 2: Releasing Screw & Removing Knock Sensor For Cylinder Bank 1 - 3

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (2) and remove knock sensor for cylinder bank 4-6.

Fig 3: Releasing Screw & Removing Knock Sensor For Cylinder Bank 4 - 6

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Clean support face of knock sensors on engine block.

Tightening torque. Refer to TORQUE SPECIFICATIONS .

Fig 4: Cleaning Support Face Of Knock Sensors On Engine Block

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Read out fault memory of control unit of Digital Motor Electronics (DME).

Now clear the fault memory.