Oxygen Sensor: Service and Repair

HEATED OXYGEN SENSOR (HO2S)


WARNING: Do not attempt HO2S removal when the exhaust is hot.


Remove
For all sensors:
1. Raise and support front of vehicle.
2. Release sensor lead from clips.

RH front sensor only
3. Remove nuts retaining coil bracket and position bracket aside.





4. Release multiplug from bracket behind cylinder head.
5. Disconnect multiplug and release sensor lead from clip.
6. Unscrew and remove sensor from exhaust pipe.

LH front sensor
7. Disconnect multiplug and release from bracket.





8. Unscrew and remove sensor from exhaust pipe using special tool LRT-12-047 (LST134).

Rear sensors





9. Release sensor cable from clips.
10. Release multiplug from bracket and disconnect.





11. Unscrew and remove sensor from exhaust pipe using special tool LRT-12-047 (LST134)

Refit
12. Ensure mating faces are clean.


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


13. 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.


14. Position HO2S with new sealing washer on exhaust pipe. Tighten to 20 Nm using special tool LR T- 12-047 (not RH front sensor).
15. Reconnect multiplug to engine harness and secure to bracket.
16. RH front sensor only:
Place coil bracket in position and fit nuts. Tighten to 8 Nm.


CAUTION: Ensure sensor leads are secured using clips provided. Failure to correctly secure leads could result in damage to HO2S.


17. Remove stands. Lower vehicle.