11 78 540 Replacing Left Monitor Sensor

11 78 540 Replacing left monitor sensor (N63)





Special tools required:
^ 11 7 020





Warning!
Scalding hazard!
Only perform this work after engine has cooled down.

Necessary preliminary tasks:
^ Check function of DME control unit
^ Turn off ignition
^ Remove air filter housing








Release retaining clip (1).

Remove heat shield wire ring (2) over oxygen sensor.

Detach oxygen sensor cable from retaining clips (3).





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

Installation:
The threads of new lambda control/monitoring sensors are already coated with Never-Seez(R) Compound (refer to BMW Parts Department).





If a lambda control/monitoring sensor is to be reused, apply a thin and even coating of Never-Seez(R) Compound to the thread only.

The part of the lambda control/monitoring sensor which projects into the exhaust branch (sensor ceramics) must not be cleaned and not coated with lubricant.





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

Tightening torque 11 78 1AZ.





Installation:
Check function of DME control unit.

Pay attention to cable routing of monitor sensor.