Knock Sensor: Service and Repair

12 14 600 Removing/Replacing Knock Sensors (N55)







IMPORTANT:
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 fault memory of DME control unit.
- Switch off ignition.
- Remove intake plenum.







Unlock connector (1) and remove.
Feed out connector (1) behind feed line, remove feed line if necessary.







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

Installation note:
- Replace aluminium screws.
- Tightening torque 13 62 5AZ.







Installation note:
Clean contact surface of knock sensors on engine block.







NOTE:
Reassemble the vehicle.
Check stored fault message.
Delete fault memory.