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 MANUALSCHEVROLET1991CAPRICE WAGON RWD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIR
1991 Chevrolet Caprice Wagon RWD V8-350 5.7L
Oxygen Sensor: Service and Repair
1991 Chevrolet Caprice Wagon RWD V8-350 5.7LSECTION Service and Repair
The oxygen sensor has a permanently attached pig-tail and connector. This pig-tail should not be removed, since removal will affect proper operation of the oxygen sensor.
1. Disconnect electrical connector from oxygen sensor.
2. Using a suitable oxygen sensor wrench, carefully remove the sensor from the exhaust manifold or pipe. The oxygen sensor may be difficult to remove when the engine temperature is below 120°F. Use CAUTION, since excessive force may damage the threads in exhaust manifold or pipe.
3. If a new oxygen sensor is being used, install the sensor into the manifold or pipe.
4. If the old sensor is being reused, coat the threads with anti-seize compound, and then install the sensor into the manifold or pipe.
5. Torque the oxygen sensor to specifications, then reconnect electrical connector. See MECHANICAL SPECIFICATIONS for sensor torque specifications.
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.