Diagnostic Software for VW-Audi Group Cars

881 Sumneytown Pike, Lansdale PA 19446, USA

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Discontinued Interfaces    Current Interfaces

Dual-K  VAG <-> USB Communications Interface

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  • USB connector plugs into most modern laptops!   (USB 1.1 or 2.0)
    A Serial Port version is also available; click here for full specs.

  • Acts as a "dongle".   No "Software Activation" required!   When used with this interface, VAG-COM is always fully-functional on any PC that meets our requirements.

  • OBD-II connector made to our own specifications.  Fits even in the "tight" cars like '96 Audi A4's, '96/'97 Audi A6's and all  European B5 Passats and B5 Audi A4's. 

  • Fully automatic support of for dual-K lines found in "new" B6/8E chassis Audi A4 and 2002+ Audi A6 -- no VAS-6017 required -- no manual switches!

  • Electronic protection against over-current conditions on both K1 and K2/L lines, no fuses required, eliminates the most common failure mode.

  • Bi-Color (red/green) status/activity LED

  • 12 month guarantee against defects.

This interface comes with an OBD-II type connector which plugs in to most 1994 and newer VW's and 1996 and newer Audis.   Many 1990-1995 Audis and 1990-1993 VW's have the "2x2" data link connector, click here for more info.


This interface works with most diagnostic-capable VW, Audi, Seat, and Skoda models from 1990 through 2004 but does not work with any model requiring a direct CAN connection for diagnostics.  If you have a 2003+, check to see if your car has a CAN connection.

Computer Requirements:  

A 500 Mhz or faster PC running Windows 98 or newer with an available USB port.  Windows XP or newer on a 1 GHz or faster PC is preferred.   If you're using an PC that isn't running Windows XP or newer or has a CPU speed less than 1 GHz, you should consider the Serial KEY-COM instead.

Extending this Interface:

The cable on this interface is about 6 feet long -- just right for most laptops.    The USB standards do not allow for passive extension cords!    We have tested many Active USB extensions and have found one that works. You can order the 16-ft Active USB Extension from our Store. We do not sell or support any other brands or models of USB extensions, if you have problems when using one,  the first thing we're going to tell you is to eliminate the extension.


If you plan to use a desktop PC, we recommend you buy the Serial KEY-COM instead. 


The KEY-USB acts as a "dongle" for VAG-COM, so VAG-COM should be fully functional on any PC when used with this interface. However, product support is provided only to the original purchaser.  If you buy a second-hand KEY-USB from someone and want support, you'll still need to pay $99 to register.

Upgrade Offer: 

Out of production -- no longer available.


The KEY-USB should be used with the latest version of VCDS software.  

Known Issues:

This interface performs best with Windows-XP or Vista.   It can be used with Windows 98, ME, or 2000, but performance may be somewhat degraded by using an OS other than Windows XP and compatibility with "difficult" control modules may be reduced.


  • This interface requires a special driver to be installed on your PC.  It does not emulate a COM port.  
    That means this interface will not work with any other software besides VCDS.

  • We do not sell any interfaces as a "Stand-Alone" products.  
    We only sell them with our VCDS software.

Driver Installation:

Click here for complete driver installation instructions.

How to order:

Out of production -- no longer available. This has been replaced with the KII-USB.

            Product Information
Discontinued Interfaces    Current Interfaces