Powertrain, generic (extended)

P2BF0 Fuel Control System B Too Lean Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Fuel system B is, in Ford's monitor documents, the port fuel injection mode of engines that also have direct injectors. P2BF0 therefore means bank 1 runs lean only when the port injectors do the work. The decision rule matches the DI codes: long-term trim past plus 25 percent, short-term trim past plus 1 percent, held for 2 seconds during closed-loop operation with purge off. The suspects differ, though. Port injectors are fed by the low-pressure side, so a weak in-tank pump or low supply pressure, a clogged port injector or air entering past a port injector O-ring or intake gasket fit better than a high-pressure fault. Ford ships port injector O-rings with the 2.7 L injector repair in bulletin 20-2324 and lists P2BF0 in its reflash bulletins 20-2257, 21-2045 and 22-2393.

Likely causes

Low-pressure fuel pump or supply pressure too weak for the port injectors
Port injector on bank 1 clogged
Air leak at a port injector O-ring or intake manifold gasket
PCM software, Ford reprogramming bulletins

Symptoms

  • Check engine light on
  • Uneven idle or surging at light load
  • Hesitation when pulling away

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–4 h

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

Parts involved

fuel injectorsfuel pressure regulatorintake system

Related codes

P2BF1P2BF2P2BECP0171P2187

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