11 78 540 Replacing Left Oxygen Monitor Sensor (N62 / N62TU)

Special tools required:

(cylinder bank 5 to 8)

Necessary preliminary tasks:

WARNING:

Scalding hazard!

Only perform this task on an engine that has cooled down.

Unlock and detach plug connection (1) for monitor sensor (2).

Unclip monitor sensor cable.

Release monitor sensor (2) with special tool 11 7 030.

Fig 1: Identifying Plug Connection And Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Threads of new oxygen sensors are already coated with Never Seez Compound.

If the oxygen sensor is reused, only apply a thin and uniform coat of Never Seez Compound to thread.

Oxygen sensor section projecting into exhaust system branch must not be cleaned or come into contact with lubricant.

Installation:

Tighten down monitor sensor (2) with special tool 11 7 030.

Tightening torque: 11 78 1AZ . See EMISSIONS-CONTROL, LAMBDA OXYGEN SENSOR for specs.

Pay attention to cable routing of monitor sensor.

Fig 2: Identifying Special Tool (11 7 030) On Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Read out fault memory of control unit of Digital Motor Electronics (DME).

Check stored fault messages.

Rectify faults.

Now clear the fault memory.