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

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 of monitoring sensor (1).

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.

Special tools required:

11 7 030
11 9 150

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

Necessary preliminary tasks:

Remove rear ignition coil cover.
Remove underbody protection. See FRONT UNDERBODY PROTECTION or FRONT UNDERBODY PROTECTION (AWD) .
Remove the CATALYTIC CONVERTER .
Remove EXHAUST SYSTEM .

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 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 Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of Digital Engine Electronics.