Oxygen Sensor (All Models)

Oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to Engine Control Module (ECM). The ECM may use input signal for determining ignition timing (spark advance) and for controlling fuel injection system. Some models may be equipped with more than one oxygen sensor. On some models, a heated oxygen sensor may be used. On heated oxygen sensors, a heater is used to warm the oxygen sensor to improve oxygen sensor detection operation. The heater is controlled by the ECM.