P2250 code meaning
O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)
Powertrain system Generic code P22xx codes Check engine light
What P2250 means
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.
P2250 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2250
- Check engine light
- Higher fuel consumption
- Repeat failure of a new sensor if the wiring short remains
Common causes of P2250
- Most likelyReference voltage wire of the bank 2 sensor shorted to heater supply or battery voltage
- PossibleInternal short between heater and Nernst cell
- Less likelyFault in the sensor interface of the ECM
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor1Oxygen sensor wiringECM
What each part of P2250 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 50 | The exact fault in that area. |
What to do next
- Note P2250 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2250
What does P2250 mean?
P2250 means "O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2250?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2250 fail an emissions test?
Yes, it can. P2250 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2250 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2250 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.