Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when heater operates, heater current exceeds 2 amps. Or when heater current of 0.20 or less when heater operates. Possible causes are:
- Open or short in heater circuit of heated oxygen sensor.
- Defective heated oxygen sensor heater.
- Defective EFI main relay.
- Defective ECM.