BMW X3 Service & Repair Manual: Removing/replacing knock sensors (N52T)

IMPORTANT: Aluminum-magnesium materials.

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

A magnesium crankcase requires aluminum screws/bolts exclusively.

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

Aluminum screws/bolts are permitted with and without color coding (blue).

For reliable identification: Aluminum 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 .

Unlock connector (1) and remove.

Electrical

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

Installation note:

Replace aluminum screws.

Electrical

Installation note:

Clean contact surface of knock sensors on engine block.

Electrical

NOTE: Check stored fault messages.

Clear diagnostic fault entries from fault memory.

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