This article will guide you how to correctly install VAG-COM 409.1 KKL USB cable on Windows and VCDS software.
CAUTION Using VAG-COM 409.1 KKL:
In our experience, we don't recommend depending on VAG-COM 409.1. Because it's functionality is extremely limited. In addition — you'll need to pay extra $97 to upgrade free VCDS-Lite software to full version. And even if you do upgrade — it can only scan vehicles made up to year 2004.
For that reason we recommend to get the complete VAG-COM 2021 cable with original, unlocked and full version of VCDS software from Ross-Tech™ — by clicking here.
STEP 1: Download and Install VAG-COM KKL 409.1 Drivers
(DO NOT connect cable to your computer yet. Only do this when you're instructed below.)
Uncompress the file. Double-click on "Install.exe" to install the drivers. When complete — plug in cable into any USB port on your computer and wait for automatic installation to complete.
If install is successful, move onto Step 2.
If installation fails, see below: Troubleshooting: If Drivers Failed To Install
Unextract the file into any folder. Then while your cable is connected to the computer — go Device Manager.
Windows Vista/7/8/10: Control Panel » System » Device Manager
Windows XP: Control Panel » System » "Hardware" tab » Device Manager
You'll see a device similar to "USB Serial Port" under either "Other devices" or "Ports (COM & LPT)".
Right-click and choose "Update Driver Software". Like this:
Then select the location where you unextracted Driver Pack 2. Let it install.
STEP 2: Discover Port Number that VAG-COM KKL Cable is Using
Go to Control Panel.
Windows Vista/7/8/10: Control Panel » System » Device Manager
Windows XP: Control Panel » System » "Hardware" tab » Device Manager
Expand "Other devices" or "Ports (COM & LPT)". Whichever contains "USB Serial Port".
Next to "USB Serial Port" — you'll see a number.
If the COM port number is between 1-4, then everything is fine. Move onto Step 3.
If the COM port number is above 4, then we'll have to change it so it's between 1-4. Here's how...
Right-click on "USB Serial Port" and click on "Properties" — as per below pic:
Then:
Click: Port Settings
Click: Advanced
For "COM Port Number" — you MUST choose any number between 1-4.
That's it! Now let's test if everything is working. Move onto next step below...
STEP 3: Test Everything is Working
Cable should be plugged into computer.
Start VCDS-Lite software.
Click "Options" button.
You will see "Select COM Port" box. Select the "COM Port" number as explained in Step 2.
Click the ‘Test’ button.
If everything is good, it should display "Interface Status: Found!".
You can now connect other end of cable to car. Turn on ignition. And you're ready to start diagnosing!
If test is not successful — check the following:
Other software or devices using USB ports or that same COM Port could be conflicting. You should uninstall the suspected software or device for troubleshooting this problem.
It should be noted that VAG-COM 409.1 KKL cable does not work on vehicles running on CAN-BUS System.
Cable must be plugged into the vehicle with ignition ON.
Test the cable with each COM Port from 1 to 4 in Windows Device Manager.
Make sure that the driver is installed and configured as explained in Step 1.
More Troubleshooting Tips:
Only Audi, Volkswagen, Skoda and Seat vehicles are supported. Other brands will only work for generic OBD-II functions.
If VAG-COM 409.1 KKL cable doesn't connect — or if you get the error message "Can't Synch Baud Rate" — then go to Options and set Start Baud to 9600. If 9600 doesn't work, try 4800 and 1200. Turn the vehicle's ignition OFF and back ON after each failed attempt to connect.
If you have installed VCDS software before or from another source, uninstall all versions of VCDS software right now, and delete directory "C:\Ross-Tech". Then install latest version of VCDS-Lite software by clicking here.
For further information and instructions for troubleshooting, visit the following links:
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In our experience, we don't recommend depending on VAG-COM 409.1. Because it's functionality is extremely limited. In addition — you'll need to pay extra $97 to upgrade free VCDS-Lite software to full version. And even if you do upgrade — it can only scan vehicles made up to year 2004. 
If the COM port number is between 1-4, then everything is fine. Move onto Step 3.
If the COM port number is above 4, then we'll have to change it so it's between 1-4. Here's how...
