11 78 510 Replacing oxygen sensor

Special tools required:

11 7 030

NOTE: Connect DIS and read out fault code memory of EMS/DME control unit. Rectify faults and clear fault memory.

Switch off ignition.

Remove heat shield.

Detach connector from retaining clips.

Fig 1: Detaching Connector From Retaining Clips

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Remove oxygen sensors.

1 oxygen sensor (upstream)

2 oxygen sensor (downstream)

Fig 2: Removing Oxygen Sensors

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Installation note:

Tighten oxygen sensor using special tool 11 7 030.

Fig 3: Identifying Special Tool

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

Installation note:

If the oxygen sensor is reused, coat thread with only a thin and uniform layer of Never Seez compound.

Do not clean and do not coat with lubricant the monitor and control section of the oxygen sensor that protrudes into the exhaust tract (sensor ceramics).

Cover the oxygen sensor (masking tape) before applying undercoating.

NOTE: Connect DIS and read out fault code memory of EMS/DME control unit. Rectify faults and clear fault memory.