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

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, 2001 BMW 525i, and 2000 BMW 528i. However, it is still accessible from the selected car via links, so may be relevant.

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: Disconnecting Cable Duct Holder Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Removing Knock Sensor (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: Removing Knock Sensor (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 ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUE .

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.