Oxygen Sensor

Pre - O2 Sensor in Operation





- If the exhaust has a lower oxygen content (rich mixture), there will be a large ion "migration" through the sensor generating a higher voltage (950 mV).
- If the exhaust has a higher oxygen content (lean mixture), there will be a small ion "migration" through the sensor generating a lower voltage (080 mV).
- This voltage signal is constantly changing due to combustion variations and normal exhaust pulsations.