P22BBO2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P22BB reports an open reference voltage line on the bank 2 downstream wide-band probe, meaning the controller has lost the Nernst-cell signal (RE/UN on Bosch, VS on NTK) it needs to regulate pump current and compute oxygen content. No maker documents this code publicly. For the upstream bank 2 relative P2247, Ford flags an open reference lead once the sensor voltage leaves 0.2-4.7 V for 10 s, and VW's 2014 Touareg data book calls the same fault an open Nernst voltage below 0.25 V or above 4.80 V with cell resistance over 950 ohms. Its bank 1 twin P22AE is listed by Chrysler for the 6.7 Cummins Ram. Only engines with two exhaust banks and a wide-band probe after each catalyst can set it. P22BC-P22BE are the performance/low/high siblings. The lamp comes on.
- What you may notice
- Check engine light
- Bank 2 downstream oxygen value invalid
- Likely causes
- LikelyCorroded or loose Nernst-cell terminal in the connector
- PossibleReference wire broken in the harness
- PossibleCracked sensing cell or internal open in the sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.