P0030
HO2S Heater Control Circuit (Bank 1 Sensor 1)
HO2S Heater Control Circuit (Bank 1 Sensor 1): the control circuit has an electrical fault. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
What we see in the workshop
ON FORD ECOBOOST
Oxygen sensor heater circuit faults are commonly a chafed harness near the exhaust rather than the sensor itself.
Common causes
Ordered by how often each turns out to be the cause.
- Heater element open or burnt outCommon
- Heater supply fuse blownPossible
- Wiring or connector faultPossible
Parts involved
- Oxygen Sensor
- Oxygen Sensor Heater
- Sensor Wiring
P0030 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.