P222FBarometric Pressure Sensor A/B Correlation
- 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
- P222F is meant for engines with two barometric sensors whose readings should agree but drift apart, without the software being able to say which of the two is wrong. No maker documents this code publicly. GM, the one maker that publishes tables for a sensor B, resolves the comparison differently: it pulls in manifold and boost pressure as further references, singles out the deviating sensor and stores P222B for sensor B or P2227 for sensor A. Ford likewise uses a three-sensor vote for P2227. A pure A/B comparison has no tiebreaker, which explains why the code is rarely seen. CARB requires rationality checks of input sensors. Both sensors, their supply and any leaks in the lines feeding them should be checked.
- What you may notice
- Check engine light
- The two barometric readings differ clearly on the scan tool
- Likely causes
- LikelyOne of the two barometric sensors has drifted
- PossibleSupply or ground offset shifting one sensor's signal
- RareBlocked port or breather of one sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.