11 78 540 Replacing left monitoring sensor (N63)

Special tools required:

11 7 020 .

WARNING: Risk of burning!
Only perform repair work after engine has cooled down.

Necessary preliminary tasks:

Check function of DME control unit.
Switch off ignition.
Remove ACOUSTIC COVER .
Remove HOLDER for engine wiring harness.

Overview:

Monitoring sensor, right
Monitoring sensor, left
Control sensor, left
Control sensor, right

Fig 1: Identifying Monitoring Sensors And Control Sensors

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Unclip plug (1) from holder.

Unlock and release plug connection.

Unclip the cable from the holder (2).

Feed out cable.

Fig 2: Identifying Plug And Holder

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Release retaining clip (1).

Remove heat shield wire ring (2) over oxygen sensor.

Fig 3: Identifying Heat Shield Wire Ring And Retaining Clip

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Release monitoring sensor (1) with special tool 11 7 020 reversible ratchet (2).

Fig 4: Releasing Monitoring Sensor With Special Tool (11 7 020)

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Installation note:

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

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

Fasten monitoring sensor (1) with special tool 11 7 020 .

Tightening torque 11 78 1AZ .

Fig 5: Fastening Monitoring Sensor With Special Tool (11 7 020)

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Installation note:

Check function of DME control unit.

Pay attention to cable routing of monitor sensor.