11 78 610 Replacing lambda oxygen monitoring sensor (N55)

WARNING: Risk of burning!
Work should only be carried out on an exhaust system that has cooled down.

Necessary preliminary tasks:

Remove MICROFILTER HOUSING .
Remove INTAKE SILENCER HOUSING .
Remove rear ignition coil cover.
Remove underbody protection. See REMOVING UNDERBODY PROTECTION (FRONT) and REMOVING REAR ENGINE UNDERCOVER .

Installation note:

The threads of new lambda monitoring sensors are already coated with Never Seez Compound.

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 (1) of monitoring sensor.

Installation note:

Cable color of control sensor = black.

Cable color of monitoring sensor = grey.

Release monitoring sensor.

Tightening torque 11 78 1AZ .

Fig 1: Identifying Plug Connection Of Monitoring Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of Digital Engine Electronics.