The KEY-USB interface was a popular Vcds Software Usb To Obd2 solution for Volkswagen, Audi, Seat, and Skoda vehicles. This article provides a comprehensive overview of the KEY-USB, including its features, compatibility, and known issues. While no longer available for purchase, understanding its specifications can be helpful for those who own one or are considering alternative diagnostic interfaces.
KEY-USB Features and Compatibility
The KEY-USB interface featured an OBD-II connector, compatible with most VW and Audi models from 1994 and 1996 onwards, respectively. Some earlier models (1990-1995 Audis and 1990-1993 VWs) utilize a “2×2” data link connector.
This interface supported diagnostic communication with most VAG vehicles from 1990 through 2004. Crucially, it did not support models requiring a direct CAN connection for diagnostics (common in 2003+ models). It’s essential to verify your vehicle’s diagnostic connection type before using a KEY-USB.
Computer Requirements and Extension Considerations
The KEY-USB required a PC with a 500 MHz or faster processor running Windows 98 or newer and an available USB port. For optimal performance, a 1 GHz or faster PC running Windows XP or newer was recommended. Users with older or less powerful PCs were advised to consider the serial KEY-COM interface instead.
The standard KEY-USB cable measured approximately 6 feet. While USB standards prohibit passive extension cords, a tested and compatible 16-foot Active USB Extension was available. Using untested USB extensions could lead to connectivity problems. Desktop PC users were generally recommended to opt for the KEY-COM interface to avoid extension issues.
Resale, Upgrades, and Software
The KEY-USB acted as a dongle for VCDS software, enabling functionality on any compatible PC. However, product support was exclusively provided to the original purchaser. Acquiring a second-hand KEY-USB did not include support, requiring a registration fee for assistance. The KEY-USB is no longer available for purchase and has been replaced by newer interface options.
The KEY-USB was designed for use with the latest version of VCDS software. Using outdated software could result in reduced functionality or compatibility issues.
Known Issues and Driver Installation
The KEY-USB performed optimally with Windows XP or Vista. While compatible with Windows 98, ME, and 2000, performance might be compromised, and compatibility with certain control modules could be reduced. A specific driver was required for the KEY-USB, and it did not emulate a COM port, limiting its use exclusively to VCDS software. The KEY-USB was not sold as a standalone product and was only available bundled with VCDS software. Detailed driver installation instructions were provided by Ross-Tech.
The KEY-USB is discontinued and has been superseded by the KII-USB interface. If you require a current VCDS interface, explore the available options on the Ross-Tech website.
