P23F7Cylinder 6 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
- P23F7 belongs to cylinder 6, the highest-numbered cylinder on a V6 or straight six. Toyota's GR V6 family is a typical carrier: the 2GR-FSE in the Lexus IS and GS and the later 2GR-FKS both use D-4S, in which the port injector supplies part of the fuel next to the direct injector, its share depending on load and engine speed. Ford's PFDI V6 engines follow the same idea. Because the split changes with the operating point, a faulty port injector may only show in the ranges where it delivers much of the fuel, which makes the fault hard to reproduce on a short test drive. CARB requires the imbalance check for these petrol engines, but no manufacturer documents P23F7 itself. Read P21A1, P0306 and the circuit code P21D4 for the same injector.
- What you may notice
- Check engine light on
- Fault comes and goes depending on driving style
- Occasional roughness at low or medium load
- Likely causes
- LikelyPort injector of cylinder 6 deviating in the ranges where it carries most of the fuel
- PossibleAir leak at the intake runner or injector seat of cylinder 6
- RareInjection split calibration needing a software update
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.