11 78 610 Replacing Oxygen Monitoring Sensors

11 78 610 Replacing monitoring sensor (N55)

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 ignition coil cover.
^ Remove the catalytic converter.





Installation note:
The threads of new monitoring sensors are already coated with NEVER-SEEZ compound (refer to BMW Parts Service).

If a monitoring sensor is to be reused, apply a thin and even coating of NEVER-SEEZ compound to the thread only.

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





Disconnect plug connection of monitoring sensor (1).

Installation note:
Cable colour of control sensor = black.

Cable colour of monitoring sensor = grey.





Remove monitoring sensor.

Tightening torque 11 78 2AZ.





Reassemble the vehicle.

Check function of DME.