BMW X3 Service & Repair Manual: Removing/replacing knock sensors (N55)

Necessary preliminary tasks:

  • Read out the fault memory of the DME control unit.
  • Switch off ignition.
  • Remove INTAKE PLENUM .
  • Vehicles with the Bosch high pressure pump only :

Remove HIGH PRESSURE PUMP .

Unlock connector (1) and remove.

Feed out connector (1) behind feed line, remove FEED LINE if necessary.

Electrical

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

Electrical

Installation note:

Clean contact surface of knock sensors on engine block.

Electrical

NOTE: Reassemble the vehicle.

Check stored error/fault messages.

Clear diagnostic fault entries from fault memory.

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