P0030 OBD II Trouble Code HO2S Heater Control Circuit (Bank 1 Sensor 1)
Detailed information on troubleshooting and repairing a P0030 DTC code which refers to a problem in the HO2S heater control circuit. Also includes links to relevant forum topics on the code.
Symptoms of P0030 OBD II Trouble Code
- Lengthened time needed to achieve closed loop
- MIL (Malfunction indicator lamp) illumination
- Possibly decreased fuel mileage depending on fault
Common Causes of P0030 OBD II Trouble Code
- Failed or damaged heater circuit element inside the HO2S
- Open on the O2 sensor heater's ground circuit
- Open or short on O2 sensor heater's B+ battery feed (on some vehicles this may be the control circuit)
- Possible ECM failure (less likely)