Oxygen Sensor: Description and Operation

Oxygen Sensor Circuit:

The heated oxygen sensor works in the same manner as the non-heated oxygen sensor. The exception is that B+ is supplied to a heating unit that is part of the sensor itself. This heater receives voltage from the generator charging circuit. The heater helps the ECM control the fuel injection sooner for better fuel emissions. There are no malfunction Codes to detect if the heater part of the sensor is working. To check the heater, refer to Chart C-1F. Chart C-1F Oxygen Sensor Heater Check