P2250: O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P2250 mean?
Bank 2 counterpart to P2246. The reference voltage at bank 2, sensor 1 is above the upper threshold, usually due to a short to positive or connector leakage.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Reference line shorted to positive
- Medium Connector corroded with leakage
- Low Supply wire pinched against B+ source
Likelihood is a general estimate across vehicles; your make and model may differ.
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