300M V6-3.5L VIN G (2000)
Downstream Oxygen Sensor 1/2
The downstream heated oxygen sensor input is used to detect catalytic convertor deterioration. As the convertor deteriorates, the input from the
downstream sensor begins to match the upstream sensor input except for a slight time delay. By comparing the downstream heated oxygen sensor
input to the input from the upstream sensor, the PCM calculates catalytic convertor efficiency.