What should the voltage be on a 02 sensor?
What should the voltage be on a 02 sensor? An O2 sensor will cycle between 0.10 to 0.90 or almost 1 volt. An O2 sensor has to reach the 0.8x Volts amplitude mark while at full operation. An O2 sensor also has to reach the 0.1x Volts amplitude mark while at full operation. (Full operation means the engine is fully warmed up, O2 sensor above the 600 deg. How to diagnose O2 sensor heater circuit failure? The modified test harness with the light will give you easy access to the circuit. Remember, the engine needs to be running at this...