P0051Low urgency
O2 Sensor Heater Circuit Low (Bank 2 Sensor 1)
Emission · Oxygen Sensors
✅ Safe to drive. Schedule repair within 2–3 weeks to pass emissions and maintain optimal fuel trim performance.
What this means
The upstream Bank 2 oxygen sensor heater circuit is drawing below-specification current. Mirrors P0031 on the opposite bank.
Likely causes
- Failed Bank 2 upstream O2 sensorMost common
- Open heater circuit wireCommon
- Corroded sensor connectorLess common
Estimated repair cost
O2 sensor replacement$120 – $300
Wiring/connector repair$80 – $200
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Frequently asked questions about P0051
What does P0051 mean?
The upstream Bank 2 oxygen sensor heater circuit is drawing below-specification current. Mirrors P0031 on the opposite bank.
Is P0051 serious?
Safe to drive. Schedule repair within 2–3 weeks to pass emissions and maintain optimal fuel trim performance.
How much does it cost to fix P0051?
Repair costs for P0051 range from $120 – $300 depending on the root cause and your vehicle.
Can I drive with P0051?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.