Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Heated oxygen sensor No. 1 monitors exhaust gas oxygen content and delivers input signals to ECM. Heated oxygen sensor No. 1 is located on exhaust pipe in front of catalytic converter and may also be referred to as bank No. 1 sensor No. 1, or front oxygen sensor. ECM uses input signals to determine fuel injection system operation. DTC is set when heated oxygen sensor No. 1 voltage remains at .42 volt or more, or .48 volt or less with engine idling and at normal operating temperature. Possible causes are:
- Heated oxygen sensor No. 1 circuit is open or shorted.
- Defective heated oxygen sensor No. 1.
- Air induction system malfunction.
- Improper fuel pressure.
- Defective fuel injector.
- Defective ECM.