P23FBCylinder 10 Injector B Air-Fuel Ratio Imbalance
- 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
- P23FB marks cylinder 10, the highest cylinder number of a V10. Among dual-injection engines, the Huracán's 5.2 litre unit is the documented case; it adds multi-point injection to direct injection. In its firing order cylinder 10 follows directly after cylinder 5. On a ten-cylinder engine an injector B deviation in cylinder 10 shows up mainly in the bank that includes cylinders 6 to 10, which is why a bank code (P219B) or a misfire code (P0310) may be the only entry. CARB requires imbalance detection for such cars too, and since 2019 to 2021 also tracking of how frequently the check runs to completion in everyday use. No manufacturer documents P23FB publicly. P21A5 and the circuit code P21D8 are the companion codes.
- What you may notice
- Check engine light on
- Bank 2 or misfire code stored alongside
- Mostly no noticeable change
- Likely causes
- LikelyPort injector of cylinder 10 dirty or worn
- PossibleInjector seal leaking air at cylinder 10
- RareHeat-damaged wiring to injector B of cylinder 10 (check P21D8)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.