Rear heated oxygen sensor (HO2S)

Measurement range 0-5 V

Voltage from the rear heated oxygen sensor (HO2S).

Oscillates between 0 and 1 V when the three-way catalytic converter (TWC) is cold (>300°C).

Stabilizes at 0.2-0.7 V when the three-way catalytic converter (TWC) is at operating temperature (<300°C)