How to check? Plug the cable into your PC. Open → Ports (COM & LPT) . If you see an unknown device or a yellow exclamation mark, right-click it → Properties → Details → Hardware Ids. Look for VID_0403 (FTDI) or VID_1A86 (CH340).
If you follow this guide and still encounter issues, the problem may be a defective cable. In that case, look for a seller that explicitly states “Windows 10 compatible” and “FTDI genuine chip” (though these are rare). Otherwise, enjoy your newfound diagnostic power.
If you encounter issues during driver installation or while using the Vag Kkl 409.1 device, try the following:
