P28FAExhaust Pressure Too Low Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P28FA is the bank 2 version of P28F9: the exhaust on the second cylinder bank carries less pressure than the load calls for. It presupposes an engine with a separate pressure reading per bank, such as a V engine with one turbocharger on each side. No manufacturer documents P28FA publicly. The likely chain mirrors bank 1: a cracked manifold or blown gasket on that side, a jammed-open flap, or the bank 2 turbine vanes stuck open. Ford's diesel summary of 2023 compares measured and modelled turbine upstream pressure but treats a mismatch as a sensor error (P0474), so a pure system code like P28FA is not what Ford uses. CARB requires underboost and exhaust system monitoring. A low value only on bank 2 while bank 1 reads normal narrows the search to that side.
- What you may notice
- Check engine light on
- Reduced power and slow boost build-up
- Exhaust noise or soot traces on bank 2
- Likely causes
- LikelyCracked manifold or leaking gasket on bank 2
- PossibleBank 2 turbocharger vanes or wastegate stuck open
- PossibleExhaust pressure flap of bank 2 jammed open
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.