Sierra 1500 2WD V6-4.3L VIN X (2004)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1
REMOVAL PROCEDURE
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Disconnect the connector position assurance (CPA) retainer.
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions.
3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).
4. Remove the bank 1 HO2S (1).
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 sensor is to be reinstalled, the threads must have
anti-seize compound applied before the reinstallation.
