Oxygen Sensor: Service and Repair

Service repair no - 19.22.16 - Front
Service repair no - 19.22.17 - Rear (NAS Spec. only)

Remove
1. Raise the vehicle.


WARNING: Support on safety stands.


2. Remove clip securing HO2S lead.







3. Release HO2S multiplug from bracket on sump or transfer gearbox. Disconnect multiplug from engine harness.







CAUTION: Although robust within the vehicle environment, HO2S sensors are easily damaged by dropping, excessive heat and contamination. Care must be exercised when working on the exhaust system not to damage the sensor housing or tip.


4. Remove sensor from exhaust front pipe. Remove sealing washer and discard.

Refit
5. Ensure mating faces are clean.


NOTE: New HO2S is supplied pre-treated with anti-seize compound.


6. If refitting existing HO2S coat threads with anti-seize compound.


CAUTION: Do not allow anti-seize compound to come into contact with HO2S nose or enter exhaust system.


7. Position HO2S with new sealing washer on exhaust pipe. Tighten to 20 Nm. (15 lbf. ft)
8. Connect multiplug to engine harness. Secure to bracket.
9. Secure lead in clip.
10. Remove stands. Lower vehicle.