Replacing Both Lambda Oxygen Monitor Sensors

11 78 545 - Replacing both lambda oxygen monitor sensors (N54)





Special tools required:
- 11 7 020 11 7 020 Socket Wrench Socket WAF 22
- 11 7 030 11 7 030 Socket Wrench Socket WAF 22
- 11 9 150 11 9 150 Special Wrench





Warning!
Scalding hazard!

Work should only be carried out on an exhaust system that has cooled down.





Necessary preliminary tasks:
- Remove rear underbody protection Removing and Installing / Replacing Rear Underbody Protection





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 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 oxygen monitor sensor.

Release monitor sensor (1) with special tools 11 7 030 11 7 030 Socket Wrench Socket WAF 22 and 11 9 150 11 9 150 Special Wrench.

Important!
When using special tool 11 7 030 11 7 030 Socket Wrench Socket WAF 22 in conjunction with special tool 11 9 150 11 9 150 Special Wrench, it is essential to reduced the prescribed tightening torque by 3 Nm.

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

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





Note:
Release insulation (2) in direction of arrow.

Disconnect plug connection for oxygen monitor sensor.

Release monitor sensor (1) with special tool 11 7 020 11 7 020 Socket Wrench Socket WAF 22.

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

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





Assemble engine.

Check function of DME control unit.