Special tools required:

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11 7 030

(cylinder bank 5 to 8)

Switch off ignition.

WARNING: Scalding hazard!
Only perform this task on an engine that has cooled down.

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

Fig 1: Releasing Oxygen Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Unclip oxygen monitor sensor cable.

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

Installation:

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

If an 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 oxygen monitor sensor (2) with special tool 11 7 030.

Fig 2: Tightening Down Oxygen Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque, 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Pay attention to cable routing of oxygen monitor sensor.

Installation:

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

Check stored fault messages.

Rectify faults.

Now clear the fault memory.