Replacing Oxygen Monitor Sensor (Cylinders 4-6)

11 78 612 - Replacing oxygen monitor sensor (cylinders 4-6)





Special tools required:
- 11 7 030 11 7 030 Socket Wrench Socket WAF 22
- 11 9 150





Necessary preliminary tasks:
- Read out DME fault memory.
- Remove protection under transmission.
- Remove cover from injector valves.





Warning!
Scalding hazard!
Only perform this task on an engine that has cooled down.





Unclip cable and plug.
Disconnect plug connection.

Important!
Mark sensor plug connections (risk of mix-up).





Note:
For purposes of clarity, this work step is shown on the removed exhaust manifold.

Release monitor sensor with special tool 11 7 030 in conjunction with special tool 11 9 150 11 9 150 Special Wrench.

Tightening torque: 11 78 1AZ 11 78 Emissions-Control, Lambda Oxygen Sensor.

Installation:
When special tool 11 9 150 11 9 150 Special Wrench is used in conjunction with special tool 11 7 030 11 7 030 Socket Wrench Socket WAF 22, 53 Nm on the torque wrench dial corresponds to an actual tightening torque of 50 Nm.





Installation Note:
Threads of new monitor sensors are already coated with Never Seez compound.
If a monitor sensor is reused, apply a thin and even coating of Never Seez compound (refer to BMW Parts Service) to the thread only.
The monitor sensor section projecting into the exhaust system branch must not be cleaned or come into contact with lubricant.
Cover monitor sensor when applying underseal.
Pay attention to cable routing of monitor sensor.
Check DME fault memory.