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

WARNING: This page is about a different car, the 2005 BMW 530i, 2005 BMW 525i, 2004 BMW 530i, and 2004 BMW 525i. 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 INTAKE MANIFOLD .

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

Fig 1: Disconnecting 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 of 3.

Fig 2: Removing Knock Sensor For Cylinder Bank 1 Of 3

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 3: Removing Knock Sensor For Cylinder Bank 4 Of 6

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Clean support face of knock sensors on engine block.

Tightening torque, see 12 14 2AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

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.