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Heated Oxygen Sensor Monitor

WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

OBD-II regulations require monitoring of upstream Heated Oxygen Sensor (HO2S) to detect if deterioration of sensor has exceeded emission thresholds. An additional HO2S is located downstream of Warm-Up Three-Way Catalytic (WU-TWC) converter, or after pre-catalytic converter to determine efficiency of catalyst. Although downstream HO2S is similar to type used for fuel control, it functions differently. Downstream HO2S is monitored to determine if a voltage is generated. That voltage is compared to a calibrated acceptable range.

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