Possible Causes
WARNING: This page is about a different car, the 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when both oxygen sensors have same amplitude after vehicle is driven for 5 minutes at 20-50 MPH. Possible causes are:
- Exhaust system leak.
- Heated oxygen sensor circuit is open or shorted.
- Defective heated oxygen sensor.
- Defective catalytic converter.