Oxygen Sensor: Description and Operation

Oxygen Sensor and Output Chart:

The oxygen sensor, located in the exhaust manifold (on the DX and LX models) or in the exhaust pipe (on the EX model), detects the oxygen content in the exhaust gas and inputs the ECU. In operation, the ECU receives the signals from the sensor and varies the duration during which fuel is injected. The oxygen sensor is combined with a heater to stabilize the sensor output.