FiatECUScan is a third-party diagnostic software. It is not an official Fiat Chrysler Automobiles (FCA) or Stellantis product. Understanding FiatECUScan: Download, Compatibility, and Legality FiatECUScan (FES) is a highly specialized Windows-based diagnostic software designed specifically for vehicles manufactured by the Fiat Group, including Alfa Romeo, Lancia, Abarth, and certain older Chrysler, Dodge, and Jeep models (particularly those based on Fiat platforms, like the Jeep Renegade or Fiat 500X).