Possible Causes
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
These DTCs uses two-trip detection logic. DTC is set when A/F sensor (Bank 1 & 2 Sensor 1) output voltage does not change after engine is started with engine at normal operating temperature, engine speed of 1400 RPM or more and with vehicle speed of 38 MPH or more. Possible causes are:
- A/F sensor (Banks 1 and 2, Sensor 1) circuit is open or shorted.
- Defective A/F sensor (Banks 1 and 2, Sensor 1).
- Air induction system malfunction.
- Improper fuel pressure.
- Defective fuel injector.
- Vehicle has run out of fuel.
- Defective ECM.