Heated Oxygen Sensors before Catalytic Converter

Heated Oxygen Sensors before Catalytic Converter

Special tools, testers and auxiliary items required

• Ring spanner 7-piece set for oxygen sensor (3337)

Removing

- Loosen quick-release fasteners - 2 - and remove rear noise insulation.





- Remove electrical harness connectors from bracket and disconnect it:





2 Heated Oxygen Sensor (HO2S) (G39) (in front of catalytic converter) black connection
3 Heated Oxygen Sensor (HO2S) 3 (G285) (in front of catalytic converter) brown connector

- Remove affected oxygen sensor using tool from Ring spanner 7-piece set for oxygen sensor (3337).

1 Heated Oxygen Sensor (HO2S) (G39)(before catalytic converter)
4 Heated Oxygen Sensor (HO2S) 3 (G285) (in front of catalytic converter)

Installing

Installation is in reverse order of removal, note the following:

• New oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body.

• For a used oxygen sensor, only coat threads with hot bolt paste. This paste must not come into contact with sensor slots. Hot bolt paste.

• Electrical wire of oxygen sensor must always be secured in the same position when installing so that contact with the exhaust pipe is avoided.

Tightening Specifications