P2250O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2250 signals that the reference voltage line of the upstream wide-band sensor on bank 2 is too high, as happens with a short to the heater feed or battery voltage, or a breakdown inside the ceramic. No manufacturer documents P2250 publicly, and no bulletin in the NHTSA index names it. Ford sends any wide-band wire shorted to supply voltage to P0152 and uses P2247 only for the open line, so Ford engines never store it. Because Bosch allows the Nernst cell only a 250 microamp load, an outside voltage on this lead can ruin a replacement sensor unless the wiring is repaired first. CARB requires fuel-control sensors to be monitored for circuit faults, with distinct codes where practical. P2246 is the bank 1 counterpart, P2249 the low fault, P2247 the open circuit.
- What you may notice
- Check engine light
- Higher fuel consumption
- Repeat failure of a new sensor if the wiring short remains
- Likely causes
- LikelyReference voltage wire of the bank 2 sensor shorted to heater supply or battery voltage
- PossibleInternal short between heater and Nernst cell
- RareFault in the sensor interface of the ECM
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.