O2 Sensor Heater

Oxygen Sensor Heater Circuit:

PURPOSE
Brings the O2 sensor to operating temperature faster than if it had to rely on exhaust gas only.

LOCATION
Within the O2 sensor (in the exhaust manifold).

OPERATION
This system controls operation (ON/OFF) of the heater which assists activation of the oxygen sensor. ECM turns the oxygen sensor heater ON (to allow the electric current to flow to the oxygen sensor heater) when the engine is running without high-load and high-speed condition.