Front Heated Oxygen Sensor

FRONT HEATED OXYGEN SENSOR (FRONT HO2S) (DTC: P0130)
The front HO2S is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air.




The sensor has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1 volt in richer conditions to 0 volts in leaner conditions. The sensor signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1 volt to 0 volts.