Knock Sensor: Service and Repair

Replacing Knock Sensor(s) (M52TU / M54)

Turn 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 Note:
Clean contact surface of knock sensors on engine block.
Tightening torque, Knock sensor 20 Nm.


NOTE:
Interrogate fault memory of DME control module.
Check stored fault messages.
Rectify faults.
Then clear fault memory.