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 MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIR
1991 Buick Century L4-151 2.5L VIN R TBI
Oxygen Sensor: Service and Repair
1991 Buick Century L4-151 2.5L VIN R TBISECTION Service and Repair
The oxygen sensor has a permanently attached wire and connector. This should not be removed, since the 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 exhaust manifold or pipe. The oxygen sensor may be difficult to remove when engine temperature is below 120°F. Use CAUTION, since excessive force may damage threads in exhaust manifold or pipe.
3. If a new sensor is being used, install the new sensor into the manifold or pipe.
4. If an old sensor is being reused, coat threads with anti-seize compound, then install the sensor into the manifold or pipe.
5. Torque the oxygen sensor to specifications, then reconnect the 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.