P0030 — HO2S Heater Control Circuit (Bank 1 Sensor 1)
Category: Powertrain Severity: Low
Updated:
DTC code P0030 means: HO2S Heater Control Circuit (Bank 1 Sensor 1). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include burned-out heater element in the upstream O2 sensor, blown heater fuse and damaged sensor wiring or connector; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Burned-out heater element in the upstream O2 sensor
- Blown heater fuse
- Damaged sensor wiring or connector
- ECU control fault
Symptoms
- Check engine light
- Higher fuel use when cold
- Failed emissions test
- Usually no drivability symptoms
How to diagnose it step by step
- Check the O2 heater fuse.
- Unplug the sensor and measure heater resistance.
- Check for 12 V supply with the ignition on.
- Replace the sensor if the heater is open.
How to fix it
Check the heater fuse and measure heater resistance across the two same-colored wires (typically 2–15 ohms). If it is open, replace the upstream O2 sensor.
Estimated repair cost
Upstream O2 sensor: $40–150 for the part; $100–300 installed.
Frequently asked questions
What does DTC code P0030 mean?
HO2S Heater Control Circuit (Bank 1 Sensor 1).
Is code P0030 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0030?
Yes, you can drive; it affects emissions and fuel use, not safety.
Related codes
P0031 P0036 P0037 P0038 P0021 P0045 P0046 P0019 P0018 P0017
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