Oxygen Sensor: Description and Operation

The heated oxygen sensor:
^ has the ability to create a voltage signal dependant on exhaust oxygen content.
^ provides feedback information to the powertrain control module used to calculate fuel delivery.

The rear heated oxygen sensor:
^ monitors oxygen content after it flows through the catalytic converter.
^ provides a voltage to the powertrain control module used to calculate catalytic converter integrity.
^ DTCs are set.
^ If the engine reaches critical temperature, the following happens:
- The coolant temperature gauge pointer will read fully hot at approximately 121°C(250°F).
- The check gauge warning indicator will illuminate.