O2 Sensor Reference Voltage Circuit (Bank 2 Sensor 1)
Bank 2 counterpart of P2243. Reference voltage on the bank 2 sensor 1 wide-band probe is missing or out of tolerance.
Affected components
- Oxygen sensor wideband
- Oxygen sensor wiring
Common causes
- High likelihood: Reference voltage line open on bank 2
- Medium likelihood: Bank 2 wide-band sensor failed
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
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.