11 78 540 Replacing left monitor sensor (N63)

Special tools required: 

• 11 7 020 

See ENGINE - SPECIAL TOOLS (N54, N63) .

Necessary preliminary tasks: 

• Check function of DME control unit
• Switch off ignition
• Remove air filter housing  . See 13 71 030 REMOVING AND INSTALLING BOTH INTAKE FILTER HOUSINGS (N63) .

  Release retaining clip (1).

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

  Detach oxygen sensor cable from retaining clips (3).

Fig 1: Identifying Heat Shield Wire Ring And Retaining Clips

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Removing Monitor Sensor With Special Tool (11 7 020)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

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

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

Secure monitor sensor (1) with special tool 11 7 020.

Tightening torque 11 78 1AZ, see EMISSION CONTROL

Fig 3: Removing Monitor Sensor With Special Tool (11 7 020)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check function of DME control unit.

Pay attention to cable routing of monitor sensor.