Oxygen (O2) Sensor

The O2 sensor generates voltage according to the oxygen content within exhaust gases. The voltage created is greater when oxygen content is low (rich), and less when oxygen content is high (lean).

By sending this information to MPFI or SPFI control unit, air/fuel ratio of supplied mixture can be determined. Characteristics of voltage stabilize at temperatures of approximately 572-752° F (300-400° C).