O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 2)
The reference voltage line for the wide-band O2 sensor on bank 1 sensor 2 is open. The reference is used as the floating mid-point for the pumping cell.
Affected components
- Oxygen sensor
Common causes
- High likelihood: Open reference voltage line
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
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
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.