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 MANUALSFORD1991LTD WAGON V8-302 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIR
1991 Ford LTD Wagon V8-302 5.0L
Oxygen Sensor: Service and Repair
1991 Ford LTD Wagon V8-302 5.0LSECTION 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.
CAUTION: 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 30-36 lb.ft. (40-50 Nm), and reconnect the electrical connector.
RENDER: 1.0x
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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.