P2246 — O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 1)
The reference voltage on the bank 1, sensor 1 wide-band oxygen sensor reads above the upper threshold. Common with a short to a positive supply or a corroded connector with leakage current.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Oxygen sensor upstream
- Oxygen sensor wiring
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Reference line shorted to positive
- Connector corroded with leakage
- Supply wire pinched against B+ source
Possible symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.