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Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2



HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 2

REMOVAL PROCEDURE




1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Remove the heated oxygen sensor (HO2S) connector from the crossmember, if equipped with a manual transmission and 2-wheel drive (2WD).
3. Disconnect the connector position assurance (CPA) retainer.

NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions.

4. Disconnect the HO2S electrical connector from the harness (2).




5. Remove the HO2S connector from the crossmember, if equipped with a automatic transmission and 2WD.
6. Disconnect the CPA retainer.
7. Disconnect the HO2S electrical connector from the harness.




8. Remove the HO2S connector from the crossmember, if equipped with 4-wheel drive (4WD).
9. Disconnect the CPA retainer.
10. Disconnect the HO2S electrical connector from the harness.




11. Remove the bank 2 HO2S (2).

INSTALLATION PROCEDURE

IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the old sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.




1. If reinstalling the old HO2S, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the bank 2 HO2S (2).

Tighten the sensor to 42 N.m (31 lb ft).




3. Connect the HO2S electrical connector to the harness.
4. Connect the CPA retainer.
5. Install the HO2S connector to the crossmember, if equipped with 4WD.




6. Connect the HO2S electrical connector to the harness.
7. Connect the CPA retainer.
8. Install the HO2S connector to the crossmember, if equipped with a automatic transmission and 2WD.




9. Connect the HO2S electrical connector to the harness (2).
10. Connect the CPA retainer.
11. Install the HO2S connector to the crossmember, if equipped with a manual transmission and 2WD.
12. Lower the vehicle.
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