Knock Sensor: Service and Repair

12 14 600 Removing/replacing Knock Sensors (N52T)







IMPORTANT:
Aluminium magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released.

Aluminium screws/bolts are permitted with and without colour coding (blue).

For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).







Necessary preliminary work:
- Read out the fault memory of the DME control unit.
- Switch off ignition.
- Remove intake plenum.







Release connector (1) and remove.







Release screws on both knock sensors (1) and remove knock sensors (1).

Installation note:
Replace aluminium screws.
Tightening torque 13 62 3AZ.







Installation note:
Clean support face of knock sensors on engine block.







NOTE:
Check stored fault messages.
Delete fault memory.