Powertrain, generic (extended)

P227F Air Flow Restriction/Air Leak Between Air Filter and MAF (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P227F means the passage between the air filter and the mass air flow sensor of bank 2 is restricted or lets air in that has bypassed the filter. By today's wording the code belongs to engines with a separate air path and MAF per bank; P2280 is the bank 1 version. FCA nevertheless sets P227F on Ram 2500 and 5500 heavy-duty trucks: STAR case S2218000013 (2022) reports it together with a prompt to service the air filter, sometimes alongside P0299 or P226C, on vehicles below 3,000 miles. The reason was factory filters whose paper media carried too much oil; a fresh filter is the first step. On the same trucks FCA treats the bank 1 sibling P2280 as a two-trip fault. A restricted filter starves the engine of air, so boost and power fall, and diesels may smoke more.

Likely causes

Air filter clogged with dust or soaked with too much oil
Intake opening blocked by snow, leaves or a collapsed duct
Loose clamp or cracked duct between filter box and MAF on bank 2
Faulty filter restriction or inlet pressure sensor

Symptoms

  • MIL on, on some trucks with an air filter service message
  • Reduced power and boost under load
  • More black smoke on diesel engines

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–250
Time0.2–1.5 h

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

Parts involved

intake air filterintake air ductmass air flow sensor

Related codes

P2280P2281P0299P226CP0101

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.