Trouble codes › P0030
P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1)
Oxygen sensors
P0030 means there's a fault in the heater circuit of bank 1's front oxygen sensor, usually a burned-out heater or a blown fuse.
The engine computer found a fault in the heater circuit of the front oxygen sensor on bank 1. The heater gets the sensor up to temperature quickly after a cold start.
Safe to drive. Fuel control may be a little off right after a cold start.
Common causes
- A failed heater inside the oxygen sensor
- A blown oxygen sensor heater fuse
- Damaged wiring or a corroded connector near the exhaust
Symptoms
- Check-engine light
- Slightly worse fuel economy on short trips
What to check first
- Check the oxygen sensor heater fuse.
- Inspect the sensor's wiring for melted or chafed spots.
- Measure the heater resistance at the sensor and compare with spec.
- Check for power at the heater feed with the key on.
What does P0030 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
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Related codes
General guidance for P0030 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.