Fuel Control Oxygen Sensors (O2S)

The main function of the fuel control heated oxygen sensor is to provide the control module with exhaust stream information. This information allows the control module to maintain proper fueling and to keep emissions within the mandated levels. After the sensor reaches operating temperature, the sensor generates a voltage inversely proportional to the amount of oxygen present in the exhaust gases.

The control module adjusts the fuel injector pulse width based on the signal voltage received in a closed loop from the fuel control heated oxygen sensors. While in a closed loop, the control module can adjust fuel delivery to maintain the correct air to fuel ratio. This provides the best combination of emission control and driveability.

If the oxygen sensor pigtail wiring, connector, or terminal are damaged, replace the entire oxygen sensor assembly. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly, the sensor must have a clean air reference provided to it. This clean air reference is obtained by way of the oxygen sensor wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference. Any attempt to repair the wires, connectors, or terminals could degrade oxygen sensor performance.