P22FFSCR NOx Catalyst Inlet Temperature Too Low
- 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
- Diesel engines raise exhaust temperature on purpose so the SCR catalyst can reduce NOx; this code reports that the gas entering the SCR stays too cold despite that. Ford describes it for the 6.7L and 3.2L diesels under its monitoring of the exhaust temperature controller: the measured SCR inlet value is compared with the setpoint, and the fault sets when it lags more than 80 °C behind for 300 s (2015 model year, roughly 800-1600 rpm and 50-600 Nm, EGT and EGR inputs fault-free). Deutz EMR5 maps P22FF to SPN 4360 FMI 1, below the normal range. Volvo cut false P22FF settings with a 2021 engine software update (KC-589). P05EB covers cold starts, P214A the opposite case.
- What you may notice
- Check engine light on
- Reduced NOx conversion, possible further SCR efficiency codes
- Code returns after extended idling
- Likely causes
- LikelyLong idling or light-load operation keeps exhaust cold
- PossibleExhaust leak ahead of the SCR cools the gas or skews the reading
- PossibleExhaust temperature sensor reading too low while still in range
- RareEngine software with overly strict monitor (update available on some makes)
- 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: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.