[fireant911]

My oxygen sensor puts out between 0.1 and 0.9 volts during normal operation though it is hard to truly determine the values since the 'brain' is continuously adjusting the mixture. As my memory serves me 0.45 volts is the stoichometric value (14.7 AFR). I have installed Westash A/F gauge to monitor the lambda activity. Unfortunately I have performed a great amount of Oxygen Sensor testing since this I previously had an inoperable lambda system.