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. 2 monitors exhaust gas oxygen content and delivers input signals to ECM. Heated oxygen sensor No. 2 is located on exhaust pipe behind catalytic converter and may also be referred to as bank No. 1 sensor No. 2, or rear oxygen sensor. ECM uses input signals to determine fuel injection system operation. DTC is set when heated oxygen No. 2 heater current draw exceeds 2 amps or is .2 amp or less when heater operates. If DTC P0141 exists, ECM will operate in fail-safe mode which turns off the heater for oxygen sensor No. 2. Possible causes are:
- Heater circuit for heated oxygen sensor No. 2 is open or shorted.
- Defective heated oxygen sensor No. 2.
- Defective ECM.