P2BF3Fuel Control System B Too Rich Bank 2
- 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
- The last of the eight mode-specific trim codes: bank 2 is too rich while the port injectors (Ford fuel system B) are active. Ford triggers it when long-term trim has gone below minus 25 percent and short-term trim continues to subtract over 1 percent for 2 seconds, with the engine warm and purge disabled. Its value lies in what it excludes: a rich fault visible only in PFI mode and only on bank 2 rules out the canister, the high-pressure side and anything shared by both banks. That leaves a port injector on bank 2 that does not close cleanly, or a bank 2 upstream oxygen sensor that reads lean and drives the mixture rich. Ford includes P2BF3 in bulletins 20-2324, 20-2257, 21-2045 and 22-2393, covering F-150 trucks with either the 2.7 L EcoBoost or the 5.0 L engine.
- What you may notice
- Check engine light on
- Fuel smell at idle
- Higher consumption
- Likely causes
- PossiblePort injector on bank 2 not sealing
- PossiblePCM software, Ford reprogramming bulletins
- RareBank 2 upstream oxygen sensor biased lean
- 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.