Oxygen Sensor: Service and Repair

11 78 513 - Replacing both lambda oxygen control sensors (N52K)





Special tools required:
- 11 4 260





Warning!
Scalding hazard!

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





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

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

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





Lambda control sensor, cylinder nos. 1 to 3:

Note:
The lambda control sensor on the exhaust manifold of cylinder nos. 1 to 3 is accessible from above. The exhaust system does not have to be removed.





Lambda control sensor, cylinder nos. 4 to 6:

Necessary preliminary tasks:
- Remove exhaust system Service and Repair





Disconnect plug connection on lambda control sensor (1).

Release lambda control sensor (1) on exhaust manifold of cylinder nos. 4 to 6 with special tool 11 4 260.





All:

Installation Note:
Cable color of lambda control sensor, cylinders nos. 1 to 3 = black.

Cable color of lambda control sensor, cylinders nos. 4 to 6 = grey.

Tightening torque 11 78 1AZ [1][2]11 78 Emissions-Control, Lambda Oxygen Sensor.

Assemble engine.

Check function of DME.