Oxygen Sensor: Description and Operation

Exhaust Gas Oxygen (EGO) Sensor:

Oxygen Sensor Operation:

The Exhaust Gas Oxygen (EGO) sensor is a voltage signal generator located in the exhaust stream ahead of the catalytic converter. The platinum surface electrode sampling tip measures and compares oxygen content difference between the ambient atmosphere and exhaust gas. The sensor generates a voltage between 0 volts (lean condition) and 1.1 volts (rich condition). The Electronic Control Assembly (ECA) reads this signal to achieve an air/fuel ratio of 14.7:1 when operating in CLOSED LOOP.