Oxygen Sensor (O2S)

Oxygen sensor detects oxygen content of exhaust gases and sends signal to ECM, which varies air/fuel ratio to maintain a 14.7:1 ratio under most conditions. This ratio is most efficient for combustion and catalytic converter operation.

All models except Civic with D15Z1 engine use heated oxygen sensors. Civic with D15Z1 engine uses a heated linear air/fuel ratio type oxygen sensor which performs the same function as standard oxygen sensor, but over a wider range.