11 78 540 Replacing left monitor sensor (N63)

Special tools required:

11 7 020

WARNING: Risk of burning!
Only perform this work after engine has cooled down.

Necessary preliminary work:

Check function of DME control unit
Switch off ignition
Remove AIR FILTER HOUSING

Release retaining clip (1).

Remove heat shield wire ring (2) over oxygen sensor.

Detach oxygen sensor cable from retaining clips (3).

Fig 1: Identifying Left Side Oxygen Sensor, Retaining Clip, Wire Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Release monitoring sensor (1) with special tool 11 7 020 .

Fig 2: Removing/Installing Monitoring Sensor Using Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

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

If a lambda control/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 control/monitoring sensor which projects into the exhaust branch (sensor ceramics) must not be cleaned and not coated with lubricant.

Fasten monitoring sensor (1) with special tool 11 7 020 .

Tightening torque 11 78 1AZ .

Fig 3: Removing/Installing Monitoring Sensor Using Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Check function of DME control unit.

Pay attention to cable routing of monitor sensor.