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this is how to connect your computer to your vag cable. vag12.12 error: interface not found to resolve. getting the latest version for your genuine kit should solve the problem. If the vcds is suddenly not starting anymore this is what you can do to solve it.

Usb Interface Not Found! Vcds Error! Driver Error you should see a message like this: if the interface status is “not found!”,check the connections at the car and pc.make sure both are plugged in rial interfaces get their power from the vehicle so they will not be recognized at all if not plugged into a car. firstly, supply 12v power to the vag com vcds interface, connect atmega 162 chip with port lpt of the pc to program it as shown on this picture. here obd2repair share with you the solution. Error: vag com does not work, (not plugged into car message interface not work) and can't update it to vag com 12.10.3. if needed, the port test will mention an update is required, and when you click, a new window with an button will appear. with vcds 11.11.4, the firmware version is updated to 1.92 for the hex usb can interfaces. To do the firmware update, the interface must be plugged up to a car when doing the port test.

and changed com port in device manager on laptop to vcds.blue light flash on cable conector when connected to car!. But some customers feedback that: when they install vag vcds 11.11 or vagcom 11.11.3 on the laptop and connect to the car.but message was: interface not found.they also tried port 1,2,3,4 and usb. usb library version 03.02.07 interface not found! i went into device manager and i see ross tech direct usb interface showing under universal serial bus controller. when i then open the program and select test, i get the message ross tech usb interface not found. I have installed vcds 18.9.0, but the usb drivers are not recognized.
