11 78 610 Replacing lambda oxygen 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. See 12 REMOVING AND INSTALLING/REPLACING IGNITION COIL COVER (N55) .
Remove rear UNDERBODY PROTECTION .

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 branch (sensor ceramics) must not be cleaned and not coated with lubricant.

Disconnect plug connection on oxygen control sensor (1).

Installation note:

Cable color of oxygen control sensor = black.

Cable color of oxygen monitoring sensor = grey.

Fig 1: Identifying Plug Connection On Oxygen Control Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Release oxygen control sensor (1) with special tools 11 7 030 and 11 9 150 with a suitable extension (2).

Tightening torque: 11 78 1AZ .

IMPORTANT: When using special tool 11 7 030 in conjunction with special tool 11 9 150 , it is essential to reduce the prescribed tightening torque by 3 Nm.

Fig 2: Releasing Oxygen Control Sensor With Special Tools (11 7 030)

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of Digital Engine Electronics.