P227FAir Flow Restriction/Air Leak Between Air Filter and MAF (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
- 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.
- What you may notice
- MIL on, on some trucks with an air filter service message
- Reduced power and boost under load
- More black smoke on diesel engines
- Likely causes
- LikelyAir filter clogged with dust or soaked with too much oil
- PossibleIntake opening blocked by snow, leaves or a collapsed duct
- PossibleLoose clamp or cracked duct between filter box and MAF on bank 2
- RareFaulty filter restriction or inlet pressure sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.