Oxygen Sensors Before Catalytic Converter

Oxygen Sensors before Catalytic Converter

Special tools, testers and auxiliary items required

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

Removing

- Disconnect vacuum hose - 2 - from air duct hose.





- Disconnect air guide hose - 1 - at Throttle Valve Control Module (J338).

- Disconnect Mass Air Flow (MAF) Sensor (G70) electrical connector - 3 -.

- Remove upper section of air filter housing - arrows -.

- Remove filter element.

- Pull off air duct cover - 1 -.





- Unclip air duct - 2 -.

- Unbolt lower section of air filter housing - arrows -.





- Disconnect electrical harness connector - 1 - for Heated Oxygen Sensor (HO2S) 2 (G108) or - 2 - for Heated Oxygen Sensor (HO2S) (G39).





- Free up electrical wires to oxygen sensors.

- Remove Heated Oxygen Sensor (HO2S) 2 (G108) - 1 - or Heated Oxygen Sensor (HO2S) (G39) - 2 -.





Installing

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

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

• When reinstalling the previously used oxygen sensor, coat thread with hot bolt paste. Paste must not get on to slits of sensor body.

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

• When installing, re-install heat insulation sleeves at the same locations.

Tightening Specifications