Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003C TAHOE 2WD V8-5.3L VIN TREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIRBANK 1 SENSOR 1
2003 Chevrolet C Tahoe 2WD V8-5.3L VIN T
Bank 1 Sensor 1
2003 Chevrolet C Tahoe 2WD V8-5.3L VIN TSECTION 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. If necessary, unbolt the front propeller shaft from the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
3. Disconnect the connector position assurance (CPA) retainer.
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions Heated Oxygen and Oxygen Sensor Notice
.
4. Remove the heated oxygen sensor (HO2S) electrical connector from the fuel line clip.
5. If equipped with a 4.8L or 5.3L engine, disconnect the HO2S electrical connector (1).
6. If equipped with a 6.0L engine, disconnect the HO2S electrical connector (1).
7. Remove the HO2S.
NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions Excessive Force and Oxygen Sensor Notice.
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.
1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
NOTE:Refer to Component Fastener Tightening Notice in Service Precautions Fastener Notice.
2. Install the HO2S.
Tighten
Tighten the sensor to .........................................42 N.m (31 lb ft).
3. If equipped with a 6.0L engine, connect the HO2S electrical connector (1).
4. If equipped with a 4.8L or 5.3L engine, connect the HO2S electrical connector (1).
5. Install the HO2S electrical connector to the fuel line clip.
6. Disconnect the CPA retainer.
7. If necessary, bolt the front propeller shaft to the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
8. Lower the vehicle.
REMOVAL PROCEDURE
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. If necessary, unbolt the front propeller shaft from the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
3. Disconnect the connector position assurance (CPA) retainer.
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions Heated Oxygen and Oxygen Sensor Notice
.
4. Remove the heated oxygen sensor (HO2S) electrical connector from the fuel line clip.
5. If equipped with a 4.8L or 5.3L engine, disconnect the HO2S electrical connector (1).
6. If equipped with a 6.0L engine, disconnect the HO2S electrical connector (1).
7. Remove the HO2S.
NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions Excessive Force and Oxygen Sensor Notice.
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.
1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
NOTE:Refer to Component Fastener Tightening Notice in Service Precautions Fastener Notice.
2. Install the HO2S.
Tighten
Tighten the sensor to .........................................42 N.m (31 lb ft).
3. If equipped with a 6.0L engine, connect the HO2S electrical connector (1).
4. If equipped with a 4.8L or 5.3L engine, connect the HO2S electrical connector (1).
5. Install the HO2S electrical connector to the fuel line clip.
6. Disconnect the CPA retainer.
7. If necessary, bolt the front propeller shaft to the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
8. Lower the vehicle.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.