Knock Sensor: Service and Repair

Replacing Knock Sensor (M52TU, M54, M56)

Necessary preliminary tasks:
- Check stored fault messages.
- Switch off ignition.
- Remove intake air manifold.







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







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







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







Installation:
Clean support face of knock sensors on engine block.
Tightening torque, 20 Nm.

Installation:
- Read out fault memory of control unit of Digital Motor Electronics (DME).
- Now clear the fault memory.