P0031Low urgency

O2 Sensor Heater Circuit Low (Bank 1 Sensor 1)

Emission · Oxygen Sensors

✅ Safe to drive. Will cause slightly slower cold-start fuel trim corrections and an emissions test failure. Fix within 2–3 weeks.

What this means

The internal heater element inside the upstream Bank 1 oxygen sensor is drawing below-normal current. The heater brings the sensor to operating temperature quickly after cold start.

Likely causes

Failed O2 sensor heater elementMost common
Open in heater circuit wiringCommon
Blown O2 heater fuseCommon

Estimated repair cost

O2 sensor replacement$120 – $300

Wiring repair$80 – $200

Fuse replacement$5 – $20

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Frequently asked questions about P0031

What does P0031 mean?

The internal heater element inside the upstream Bank 1 oxygen sensor is drawing below-normal current. The heater brings the sensor to operating temperature quickly after cold start.

Is P0031 serious?

Safe to drive. Will cause slightly slower cold-start fuel trim corrections and an emissions test failure. Fix within 2–3 weeks.

How much does it cost to fix P0031?

Repair costs for P0031 range from $120 – $300 depending on the root cause and your vehicle.

Can I drive with P0031?

Yes, the vehicle is safe to drive. Schedule a repair at your convenience.

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