OBD-II code · Powertrain (generic, extended)
P24FE SCR Catalyst Incorrect
The ECM identifies the installed SCR catalyst as the wrong part — NOx conversion efficiency, NH3 storage capacity or coded part-number do not match the expected application. Typical after fitting a non-OEM SCR brick or after a coding error following replacement.
Is it safe to drive with P24FE?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyIncorrect or non-OEM SCR catalyst installed
- PossibleCoding mismatch after part replacement
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Scr Catalyst
Related codes
- P24FBExhaust Aftertreatment Fuel Air Purge Valve Control Circuit High
- P24FCParticulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too High
- P24FDParticulate Filter A Incorrect
- P24FFReductant Temperature Too High
- P2500Generator Lamp/L-Terminal Circuit Low
- P2501Generator Lamp/L-Terminal Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.