BMW X3 Service & Repair Manual: Removing/replacing knock sensor (3rd and 4th cylinder) (N20, N26)

Necessary preliminary tasks:

Unlock connector (1) and remove.

Release bolt (2) on knock sensor.

Remove knock sensor for 3rd and 4th cylinders.

Electrical

Installation note:

Clean contact surface of knock sensor on engine block.

Electrical

NOTE: Reassemble the vehicle.

Check stored fault message.

Delete fault memory.

Necessary preliminary tasks: Read out the fault memory of the DME control unit. Switch off ignition. Remove THROTTLE VALVE ASSEMBLY . Unloc ...

IMPORTANT: Aluminum-magnesium materials. No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium cr ...

BMW X3 Service & Repair Manual > Troubleshooting: Instructions for welding work (overload protection of control units)
CAUTION: Follow instructions for body repairs. When performing welding work on installed control units, to avoid any defects in the electronic control units, observe the following steps: Observe instructions for disconnecting and connecting battery. Detach terminal of battery negative l ...

BMW X3 Owners Manual