P22BEO2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P22BE is stored when the reference voltage lead of the bank 2 downstream wide-band probe carries more voltage than a working Nernst cell can produce. A healthy cell produces well under one volt from a source of roughly 300 ohms, so contact with the heater feed, a 5 V line or battery voltage swamps it, and a cracked ceramic can let heater potential leak into the cell. No maker documents this code publicly. On upstream probes the top of the scale is already an open-circuit criterion: Ford and Saab react above 4.7 V, VW's Touareg above 4.80 V, while Ford files shorts to battery under P0152 for bank 2. Under CARB rules a secondary sensor must also be checked for readings outside its range. P22BB is the open, P22BD the low reading, P22B1 bank 1. The lamp comes on.
- What you may notice
- Check engine light
- Bank 2 downstream oxygen reading pinned at the upper limit
- Heater codes for the same sensor may appear alongside
- Likely causes
- LikelyNernst-cell lead shorted to the heater supply or another live wire
- PossibleCracked ceramic letting heater voltage into the sensing cell
- RareFaulty sensor interface in the engine control module
- 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: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.