11 78 613 Replacing Both Lambda Oxygen Monitor Sensors

11 78 613 Replacing both lambda oxygen monitoring sensors (N52K)

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.






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

If a lambda monitoring sensor is to be reused, apply a thin and even coating of Never Seez Compound to the thread only.

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






Disconnect plug connection for oxygen monitoring sensor.
Release and tighten lambda monitoring sensor (1) on exhaust manifold of cylinder nos. 1 to 3 with special tool (2) 11 9 150.
Tightening torque 11 78 1AZ.

Installation:
Cable colour of lambda monitoring sensor (1), cylinders nos. 1 to 3 = black.






Disconnect plug connection for oxygen monitoring sensor.
Release and tighten lambda monitoring sensor (1) on exhaust manifold of cylinder nos. 4 to 6 with special tool (2) 11 9 150.
Tightening torque 11 78 1AZ.

Installation:
Cable colour of lambda monitoring sensor (1), cylinders nos. 4 to 6 = grey.






Assemble engine.
Check function of DME.