Heated Oxygen Sensor (O2)

The O2 sensor is located in the exhaust manifold and provides an input voltage to the ECU relating oxygen content of the exhaust gas. The ECU uses this information to vary the air/fuel ratio. The O2 sensor is equipped with a heating element that keeps O2 sensor at proper operating temperature during all engine operating conditions. Maintaining correct sensor temperature at all times allows the system to enter into "Closed loop" operation sooner and to remain in "Closed Loop" operation during periods of extended engine idle. Voltage is supplied to the O2 sensor through the ignition switch.