P22BB: O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 2)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P22BB mean?
The reference voltage line for the wide-band O2 sensor on bank 2 sensor 2 is open. The reference is used as the floating mid-point for the pumping cell.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Open reference voltage line
- Low Pin pushed back out of connector body
- Low Cracked solder joint inside the module or sensor
Likelihood is a general estimate across vehicles; your make and model may differ.
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