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 8 amps. Or when heater current of 0.30 or less when heater operates. Possible causes are:
- Open or short in heater circuit of A/F sensor.
- Defective A/F sensor heater.
- Defective ECM.