Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
DTCs P0037 & P0043
- Open or short in heater circuit of heated oxygen sensor.
- Defective heated oxygen sensor heater.
- Defective EFI relay.
- Defective EFI fuse.
- Defective ECM.
DTCs P0038 & P0044
- Short in heater circuit of heated oxygen sensor.
- Defective heated oxygen sensor heater.
- Defective ECM.