Heated Oxygen Sensor (Ho2S): Removal
WARNING: This page is about a different car, the 1997 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Unplug electrical connector from HO2S. Sensor may be difficult to remove when engine temperature is less than 120°F (48°C). Carefully remove HO2S sensor from exhaust pipe.