11 78 545 Removing and Installing/Replacing Monitor Sensor

11 78 545 Replacing both oxygen monitoring sensors (N54, N54T)

Special tools required:





Warning!
Risk of burning!
Work should only be carried out on an exhaust system that has cooled down.

Necessary preliminary work:
^ Remove rear underbody protection








Installation note:
If an oxygen sensor is to be reused, only apply a thin and uniform coat of NEVERSEEZ compound (refer to BMW Parts Department) to thread.

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





Disconnect plug connection for oxygen monitoring sensor.

Release monitoring 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 reduce the prescribed tightening torque by 3 Nm.

Tightening torque 11 78 1AZ.

Installation note:
Cable colour black, cylinders 1 to 3.





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

Disconnect plug connection for oxygen monitoring sensor.

Release monitoring sensor (1) with special tool 11 7 020.

Tightening torque 11 78 1AZ.

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





Assemble engine.

Check function of DME control unit.