It will recalculate new checksum automatically and will remove the "DEF" error from IC.
A blue OBD-II KKL USB cable (often using the FTDI FT232 or CH341 chip). Supported Systems: Works best on Windows 7 or Windows XP . Vag Eeprom Programmer 1.19g Download
VAG EEPROM Programmer 1.19g is a specialized software tool used by automotive enthusiasts and technicians to read, write, and modify the EEPROM (Electrically Erasable Programmable Read-Only Memory) of various Volkswagen Audi Group (VAG) vehicles. This specific version, 1.19g, is often sought after for its ability to work through drivers, which improves compatibility with common USB-KKL cables . Key Features and Capabilities It will recalculate new checksum automatically and will
Turn the ignition off for 30 seconds. Turn it back on. Scan with VCDS – the crash code should now be cleared. VAG EEPROM Programmer 1
Because this is an older, "freeware" style utility often hosted on third-party forums or file-sharing sites, downloads should be scanned for viruses and run in a sandboxed environment if possible.