11 78 510 Replacing oxygen control 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.

Installation note:

The threads of new oxygen control sensors are already coated with Never Seez Compound.

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

Necessary preliminary tasks:

Remove INTAKE PLENUM .

Disconnect plug connection on oxygen control 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 oxygen control sensor with special tool 11 4 260 and with a suitable extension (1).

Tightening torque 11 78 1AZ .

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

Fig 2: Releasing Oxygen Control Sensor With Special Tool (11 4 260) And Suitable Extension

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of DME.