P04DAClosed Loop EGR Control At Limit - Flow Too High
- 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
- Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. P04DA is the counterpart of P04D9: the control cannot lower the flow far enough even at the end of its range. CARB requires this for petrol engines from model years 2019–21 and for diesels. Ford's 6.7-litre diesel sets it when the desired minus the measured EGR rate stays below −60 points for 20 s with EGR in closed loop. Too much exhaust in the cylinder causes soot, rough running and, on petrol engines, misfire up to stalling at idle.
- What you may notice
- Check engine light on
- Rough idle, jerking
- Smoke or soot (diesel), possibly stalling at idle (petrol)
- Likely causes
- LikelyEGR valve not closing (soot at the seat, stuck open)
- PossibleAir mass meter reading too little fresh air (EGR rate calculated too high)
- PossiblePosition or EGR temperature sensor giving a wrong value
- RareIntake or exhaust throttle wrong (pressure difference too large)
- 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: €150 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.