Removing and Installing/Replacing Both Lambda Oxygen Monitor Sensors

11 78 545 - Removing and installing/replacing both lambda oxygen monitor sensors (N52)





Special tools required:
- 11 4 260 11 4 260 Box Spanner





Warning!
Scalding hazard!

Only perform these tasks after the exhaust system has cooled down.





Necessary preliminary tasks:
- Remove engine splash guard.
- Remove exhaust system Service and Repair.





Installation Note:
If an oxygen sensor is to be reused, only apply a thin and uniform coat of Never Seez Compound (refer to BMW Parts Service) to thread.

The part of the the oxygen monitor sensor which projects into the exhaust system branch (sensor ceramic) must not be cleaned or come into contact with lubricant.





Disconnect plug connection for lambda monitor sensor.

Release monitor sensor (1) with special tool 11 4 260 11 4 260 Box Spanner.

Tightening torque: 11 78 1AZ 11 78 Emissions Control, Control Sensor / Monitor Sensor.

Installation Note:
Cable color black, cylinders 1 to 3.





Note:
To remove the monitor sensor for cylinders 4 to 6, it is necessary to remove the exhaust system Service and Repair.

Disconnect plug connection for lambda monitor sensor.

Release monitor sensor (1) with special tool 11 4 260 11 4 260 Box Spanner.

Tightening torque: 11 78 1AZ 11 78 Emissions Control, Control Sensor / Monitor Sensor.

Installation Note:
Cable color gray, cylinders 4 to 6.





Assemble engine.

Check function of DME.