Alero L4-144 2.4L DOHC VIN T SFI (2000)
Oxygen Sensor: Description and Operation
The main function of the fuel control heated oxygen sensor is to provide the control module with exhaust stream information in order to allow proper
fueling and maintain emissions within the mandated levels. After the sensor reaches the operating temperature, the sensor generates 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 a closed loop in order to adjust the fuel injector pulse width.
While in a closed loop, the control module can adjust fuel delivery in order to maintain an air-to-fuel ratio which allows 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. This clean air reference is obtained by the
oxygen sensor wires. Any attempt to repair the wires, the connectors, or the terminals could result in the obstruction of the air reference. Any attempt to
repair the wires, the connectors, or the terminals could degrade oxygen sensor performance.
