Powertrain, generic (extended)

P2BF3 Fuel Control System B Too Rich Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Port injector on bank 2 not sealing
PCM software, Ford reprogramming bulletins
Bank 2 upstream oxygen sensor biased lean

Symptoms

  • Check engine light on
  • Fuel smell at idle
  • Higher consumption

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.3–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorsfuel pressure regulatorintake system

Related codes

P2BF1P2BF2P2BEFP0175P2190

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.