Circuit Description
WARNING: This page is about a different car, the 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit description, see Circuit Description under DTC P0031, P0032, P0037, P0038, P0051, P0052, P0057 OR P0058.
DTC is set when engine is warmed up and is idling, ECM detects a response time of one second or more for sensor to change from rich to lean, or lean to rich (2 trip detection logic). Possible causes are:
- Open or short in heated oxygen sensor circuit.
- Faulty heated oxygen sensor.
- Air induction system fault.
- Improper fuel system pressure.
- Faulty injector.
- Faulty ECM.