BMW X5 Owners & Service Manuals

BMW X5: Removing/Replacing Knock Sensors (N52, N52K, N51)

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.

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

IMPORTANT: Mixing up the knock sensor plug connections will result in engine damage! Routing of wires and plug connections must conform to the original routing.

This eliminates the risk of confusion and mix-ups.

Release screws on both knock sensors. Remove knock sensors (1).

Installation:

Replace aluminum screws.

Tightening torque 12 14 1AZ.

Electronic Switching On Or Control Unit
Fig. 29: Identifying Knock Sensors

Installation:

Clean support face of knock sensors on engine block.

NOTE: Check stored fault messages.

Now clear the fault memory.

CODING CONTROL MODULE (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Coding" program.

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units:

Refer to "Diagnosis and Coding" service information bulletins on subject of coding.

PROGRAMMING CONTROL UNIT (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Programming".

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units:

Refer to "Diagnosis and Coding" service information bulletins on subject of programming.

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection).

NOTE: Follow instructions for removing and installing electronic control.

Necessary preliminary tasks:

Pull rubber grommets out of electronics box. Disconnect all plug connections.

Release screws (arrows).

Disconnect wiring harness on engine compartment side on right.

Remove electronics box.

Installation:

Make sure gasket (1) is correctly seated on electronics box. Add final details to vehicle.

Read fault memory.

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