Fuel Control Heated Oxygen Sensors

The main function of the fuel control heated oxygen sensors is to provide the control module with exhaust stream information to allow proper fueling and maintain emissions within mandated levels. After it reaches operating temperature, the sensor will generate a voltage, inversely proportional to the amount of oxygen present in the exhaust gases. The control module uses the signal voltage from the fuel control heated oxygen sensors in "closed loop" to adjust fuel injector pulse width. While in closed loop, the ECM can adjust fuel delivery to maintain an air/fuel ratio which allows the best combination of emission control and driveability.