11 78 510 Replacing oxygen control sensors (N20, N26)

Special tools required :

WARNING: Risk of burning!
Work should only be carried out on an exhaust system that has cooled down.

Installation note :

The threads of new oxygen control sensors are already coated with NEVER SEEZ COMPOUND 4.3 .

If an oxygen control sensor is to be reused, apply a thin and even coating of NEVER-SEEZ compound to the thread only.

Sensor ceramics not cleaned and not coated with lubricant.

Necessary preliminary tasks :

Disconnect plug connection on oxygen control sensor (1).

Installation note :

Cable color of oxygen control sensor = black.

Cable color of oxygen monitoring sensor = grey.

Fig 1: Identifying Oxygen Sensor Connector And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release oxygen control sensor (2) with special tool 11 4 260 .

Tightening torque 11 78 1AZ .

Fig 2: Releasing Oxygen Control Sensor Using Special Tool (11 4 260)

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of DME.