11 78 540 Replacing left monitoring sensor (N63O1)

Special tools required: 

• 11 7 020

Necessary preliminary tasks: 

• Check function of DME control unit
• Switch off ignition
• Remove INTAKE SILENCER 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 Heat Shield Wire Ring And Retaining Clips

Courtesy of BMW OF NORTH AMERICA, INC.

Remove heat shield wire ring over oxygen sensor.

Detach oxygen sensor cable from retaining clips.

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 oxygen control/monitoring sensors are already coated with 4.2 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.