P2BF1Fuel Control System B Too Rich Bank 1
- 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
- With P2BF1 the PCM has seen bank 1 too rich while fuel came through the port injectors, Ford's fuel system B. Ford flags it when the long-term value sits beyond minus 25 percent and the short-term value still takes away above 1 percent, for a 2 second window in closed loop. Since this monitor only runs with the canister purge valve closed, vapour from the evaporative system cannot explain the result; the excess fuel comes from the injection side or from a wrong air reading. Typical findings are a port injector that leaks into the intake runner, too much low-side fuel pressure or a mass air flow signal that reads low. If the rich condition is present in DI mode too, Ford stores P0172 instead. Ford names P2BF1 in its F-150 reflash bulletins for the 2.7 L and 5.0 L engines.
- What you may notice
- Check engine light on
- Fuel smell, black exhaust deposits
- Rough idle when warm
- Likely causes
- PossiblePort injector on bank 1 leaking or dribbling
- PossiblePCM software, Ford reprogramming bulletins
- RareLow-side fuel pressure above specification
- RareMass air flow sensor under-reporting
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.