Lincoln 9E5Z-9F472-E Sensor - Hego

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To replace the upstream oxygen sensor, you need to locate it, disconnect the electrical connector, and then unscrew the sensor using a wrench or oxygen sensor socket. Apply anti-seize compound to the threads if reusing the old sensor.

1. Disconnect the negative battery terminal. 2. Disconnect the downstream oxygen sensor electrical connector. 3. Raise the front of the vehicle and secure it on jackstands. 4. Locate and unscrew the downstream oxygen sensor. 5. Apply anti-seize compound if reinstalling the old sensor. 6. Install the sensor and tighten it to the specified torque. 7. Reconnect the battery and allow the PCM to relearn its idle and fuel trim strategy.

It uses an oxygen sensor ahead of the catalytic converter and another behind it to compare the oxygen content in the exhaust gases before and after the catalyst.