P24FESCR Catalyst Incorrect
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24FE means the controller concludes that the SCR catalyst is missing or not the expected part. Ford runs this test on the 6.7 L diesel (2023 summary) for about 60 s with SCR inlet at 195–340 °C and feedgas NOx of 70–500 ppm, and sets the code when cumulative SCR efficiency falls below 0 %. Hino's J08E workshop text (SB-19-008, 2017–2020 conventional trucks) treats it as removal of the DEF SCR catalyst: average NOx conversion at or under 0.03 for 10 s, MIL off but service lamp on, low power. Hino alert SA-17-036 had first told dealers to clear and release trucks. Ford TSB 24-2136 links P24FE on 2020–2022 Super Duty to NOx sensor 11, fixed by a new sensor and software. Ordinary ageing is P20EE.
- What you may notice
- Warning or service lamp (Hino sets the service lamp, MIL stays off)
- Reduced engine power
- NOx downstream of the SCR as high as upstream in live data
- Likely causes
- LikelyUpstream or downstream NOx sensor misreading (Ford sensor 11, Hino NOx sensors)
- PossibleSCR catalyst removed or replaced by a non-matching part
- PossibleController software detecting removal falsely, fixed by reprogramming
- RareDiluted DEF or faulty DEF injector collapsing NOx conversion
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.