11 78 545 Replacing oxygen monitoring sensors (W20)

Special tools required:

11 4 260

WARNING: Risk of burning!
Only carry out this repair work when the exhaust system has cooled down.

Necessary preliminary tasks:

Remove INTAKE PLENUM .

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 lambda monitoring sensor (1).

Installation note:

Protective sleeve color of oxygen control sensor = black.

Protective sleeve color of oxygen monitoring sensor = grey.

Illustration shows N20 engine.

Fig 1: Identifying Oxygen Control Sensor Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Release and remove insulation (1) on push-button.

Fig 2: Removing Insulation On Push-Button

Courtesy of BMW OF NORTH AMERICA, INC.

Release oxygen monitoring sensor (1) with special tool 11 4 260.

Tightening torque 11 78 2AZ .

IMPORTANT: When using special tool 11 4 260, it is essential to reduce the prescribed tightening torque by 3 Nm.

Fig 3: Releasing Oxygen Monitoring Sensor With Special Tool (11 4 260)

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of DME.