Description
What Does an O2 Sensor Do?
The O2 sensor is responsible for measuring how much unburned oxygen is in the exhaust. It communicates with your vehicle’s electronic control unit (ECU) to help figure out what the right air-to-fuel ratio should be for the best engine performance.
Through monitoring these oxygen levels, the O2 sensor performs the important role of measuring this mixture so that the fuel injection system can adjust accordingly. O2 sensors can tell the ECU whether a fuel mixture is too lean (meaning there is too much oxygen) or too rich (not enough oxygen).
O2 sensors became mandatory on vehicles starting in 1981, and many vehicles made after 1996 were required to have multiple oxygen sensors. The additional O2 sensors are used to monitor how the catalytic converter is operating.
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