P0155Low urgency
O2 Sensor Heater Circuit (Bank 2 Sensor 1)
Emission · Oxygen Sensors
✅ Safe to drive. Causes slow cold-start enrichment correction and emissions monitor delays. Fix within 2–3 weeks.
What this means
The Bank 2 upstream O2 sensor heater circuit has a fault. The heater allows the sensor to reach operating temperature quickly after cold start.
Likely causes
- Failed Bank 2 upstream O2 sensorMost common
- Open heater circuit wiringCommon
Estimated repair cost
O2 sensor replacement$120 – $300
Wiring repair$80 – $200
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Frequently asked questions about P0155
What does P0155 mean?
The Bank 2 upstream O2 sensor heater circuit has a fault. The heater allows the sensor to reach operating temperature quickly after cold start.
Is P0155 serious?
Safe to drive. Causes slow cold-start enrichment correction and emissions monitor delays. Fix within 2–3 weeks.
How much does it cost to fix P0155?
Repair costs for P0155 range from $120 – $300 depending on the root cause and your vehicle.
Can I drive with P0155?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.