Oxygen Sensor: Service and Repair

Oxygen Sensors

Special tools, testers and auxiliary items required

• Ring Spanner 7-Piece Set for Oxygen Sensor (3337)

Removing

• All cable ties opened or cut during engine removal must be reinstalled at the same locations during installation.

- On a vehicle with air suspension, activate vehicle lift mode.

- Pull rear engine cover off - arrows -.





- Pull front engine cover off - arrows -.





- Disconnect electrical connector - 2 - at Mass Air Flow (MAF) Sensor 2 (G246).





- Remove left air guide hose - 1 - from air duct.

- Release clips - 3 - and remove the left air filter upper section.

- Disconnect hose - 1 - to Secondary Air Injection (AIR) pump.





- Disconnect electrical harness connector - 4 - at Mass Air Flow (MAF) Sensor (G70).

- Remove right air guide hose - 3 - from air duct.

- Open the clips - 2 - and remove the right air filter upper section from the air filter lower section.

Vehicles with air suspension

• If necessary, remove electrical connector for Heated Oxygen Sensor (HO2S) 2 (G108) from bracket at right strut tower for better access.

- Press circlip - 1 - forward from hose coupling.





- Press the release ring - 2 - down - arrows - and remove the ventilation hose - 3 - from the air filter upper section.

All:

- Disconnect vacuum hose - 2 - to Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) by pressing release button.





- Free up vacuum hose.

• Ignore - 1 and 3 -.

- Disconnect electrical harness connector - 2 - from Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80).





- Remove Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) - 1 - from bracket and lay aside.

• Ignore - 3 -.

- Remove the vacuum hoses - 2 - and - 4 -.





The crankcase ventilation vacuum hose - 2 - must not be removed. Instead, lay air guide pipe aside with vacuum hose connected.

- Loosen hose clamp - 1 - and remove bolts - 3 -.

- Remove air guide pipe to right.

- Remove affected electrical connector from bracket on right strut tower.





1. To Heated Oxygen Sensor (HO2S) (G39)

2. To Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)

3. To Heated Oxygen Sensor (HO2S) 2 (G108)

4. To Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131)

- Disconnect electrical connector and free up electrical wiring to affected oxygen sensor.

Heated Oxygen Sensor (HO2S) 2 (G108) (left)





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

Heated Oxygen Sensor (HO2S) (G39) (right)





- Remove Heated Oxygen Sensor (HO2S) (G39) - 2 -.

Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) (left) and Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) (right)





- Remove bolts and remove rear noise insulation - 2 -.

Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) (left):





- Remove Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) - 2 -.

Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) (right)

- Remove front driveshaft heat shield - arrows -.





- Remove Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) - 1 -.





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.

• 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.

• During installation, all cable ties must be re-installed at the same location.

- On a vehicle with air suspension, deactivate vehicle lift mode.

Tightening Specifications