11 78 510 Replacing oxygen control sensor (N55)

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.

If an 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 branch (sensor ceramics) must not be cleaned and not coated with lubricant.

Necessary preliminary work:

Lever out expanding rivet.

Remove gasket (1).

Unfasten screws (2).

Feed out partition wall (3) and remove.

Fig 1: Locating Partition Wall And Screws

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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 2: Identifying Plug Connection On Oxygen Control Sensor

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

Tightening torque: 11 78 1AZ .

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

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Reassemble the vehicle.

Check function of DME.