Powertrain, generic (extended)

P2BF2 Fuel Control System B Too Lean Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2BF2 combines two restrictions: the lean correction is on bank 2, and it only occurs in the port injection mode that Ford designates fuel system B. The Ford threshold is identical to the other trim codes of this family, more than 25 percent added by long-term trim plus over 1 percent by short-term trim for 2 seconds. Using both letters and both banks together helps the diagnosis. A lean result on bank 2 alone in PFI mode suggests a port injector or an intake leak on that side; lean on both banks in PFI mode (P2BF0 and P2BF2) points to the shared low-pressure supply; lean in every mode is P0174. On the 2019 to 2021 F-150 with the 5.0 L V8, bulletin 22-2393 treats this code with a PCM reflash and a keep-alive memory reset.

Likely causes

PCM software, Ford reprogramming bulletins
Port injector on bank 2 clogged
Air leak at the bank 2 intake gasket or injector O-ring
Weak low-pressure supply, usually with P2BF0 as well

Symptoms

  • Check engine light on
  • Uneven idle
  • Mild hesitation at part throttle

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

P2BF0P2BF3P2BEEP0174P2189

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.