OBD-II code · Powertrain (generic, extended)
P2250 O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)
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.
Is it safe to drive with P2250?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReference line shorted to positive
- PossibleConnector corroded with leakage
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Upstream B2, Oxygen Sensor Wiring
Related codes
- P2246O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 1)
- P2249O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 1)
- P22B1O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 2)
- P22BEO2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 2)
- P224DAlternative Fuel Tank Shutoff Valve A Control Circuit Performance/Stuck Off
- P224EAlternative Fuel Tank Shutoff Valve A Control Circuit Low
- P224FAlternative Fuel Tank Shutoff Valve A Control Circuit High
- P2251O2 Sensor Negative Current Control Circuit (Bank 1 Sensor 1)
- P2252O2 Sensor Negative Current Control Circuit Low (Bank 1 Sensor 1)
- P2253O2 Sensor Negative Current Control Circuit High (Bank 1 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.