P23F3Cylinder 2 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
- P23F3 points to cylinder 2 and to its injector B, the second of two injectors feeding that cylinder. The smallest engines able to raise it have three cylinders, for example Ford's 1.5 EcoBoost, which pairs port and direct injection and can switch one cylinder off at light load. On V engines the bank that holds cylinder 2 depends on how the maker numbers its cylinders, so read the service information before working on a side. Hyundai's Smartstream 1.0 and 1.2 MPi engines show that both injectors of a cylinder may also sit in the intake port; whether such a design calls one of them B is not published. No public document ties P23F3 to a vehicle. Compare with P219D for the same cylinder and with P21D0 for the injector B circuit.
- What you may notice
- Check engine light on
- Shaking at idle, most noticeable on small three- or four-cylinder engines
- Slightly higher fuel consumption
- Likely causes
- LikelyInjector B of cylinder 2 delivering too much or too little fuel
- PossibleAir leak at the intake port or injector seal of cylinder 2
- PossibleWork done on the wrong cylinder because of the maker's numbering scheme
- RareChafed wire to injector B of cylinder 2 (check P21D0)
- 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: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.