P2448AIR System High Air Flow (Bank 1)
- 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
- P2448 means more secondary air reaches bank 1 than the system expects – for example when the shut-off valve leaks, the pump keeps blowing, or the control logic sees a stronger lean shift than modelled. Ford uses the code: its 2012 OBD summary names P0491, P0410 and P2448 as the bank 1 codes behind the secondary air readiness and in-use monitor counters, and Ford's 2014 code list (published for the Boss 302S) marks P2448 as a MIL code. Ford does not publish a threshold for it. CARB's secondary air rules focus on low flow but demand correct function of the whole system, valves included. Common causes are a valve stuck partly open, an air pump relay that sticks, or a leaking check valve. P0491 is the insufficient-flow counterpart, P2449 covers bank 2.
- What you may notice
- Check engine lamp
- Lean-running codes or fuel trim deviation after cold start
- Likely causes
- LikelyShut-off valve does not seal fully
- PossiblePump relay sticks, pump runs longer than commanded
- RareLeaking check valve in the air path
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.