Ford 5L8Z-9G444-J Exhaust Gas Oxygen Sensor

Start and run the engine for a minute or two to warm it up, as the sensor may be difficult to loosen when cold.

Disconnect the negative battery terminal. Loosen the right front wheel lug nuts, raise the vehicle, and remove the right front wheel. Remove the right lower engine splash shield. Disconnect the downstream oxygen sensor electrical connector. Unscrew and remove the downstream oxygen sensor. Apply anti-seize compound if reinstalling the old sensor. Install the sensor and tighten it to the specified torque. Reconnect the battery and allow the PCM to relearn its idle and fuel trim strategy.