11 78 545 Removing and Installing/Replacing Monitor Sensor

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





Special tools required:







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 and 11 9 150.

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

Tightening torque 11 78 1AZ Specifications.

Installation Note:
Cable colour 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.

Tightening torque 11 78 1AZ Specifications.

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





Assemble engine.

Check function of DME control unit.