All of our Interfaces offer the following advantages over others on the market:

• If you need compatibility with the latest cars which require a direct CAN connection for diagnostics, or you're a professional mechanic or an enthusiast who demands the best, get a HEX-COM+CAN or HEX-USB+CAN. These Interfaces are also available in a Pro-Kit. See our Pro-Kit Page.
• If you're a budget-conscious hobby-user with a car which doesn't require CAN, get at KEY-COM or KEY-USB.

-Second, see if your PC has a Serial Port with 9 male pins.

• If the PC you're planning to use has a Serial Port, then we suggest you get a Serial Interface. Serial interfaces are less expensive and have slightly more precise protocol timing. They are also completely compatible with older versions of Windows (Windows 95, 98, ME, NT4 and 2000). Serial Interfaces can also be used with Desktop PC's since they are compatible with standard RS232 extension cords (which we stock in 15', 25' and 50' lengths).
• If you have a newer laptop which doesn't have a Serial Port, then you must get a USB interface. Add-on USB<->Serial Converters are not supported! USB interfaces require Windows 98, ME, 2000 or XP. They will not work with Windows 95 or NT4! USB interfaces work best with Windows XP.

Each Interface is more fully described on a page of its own.  Click on the pictures in the chart above to go to the respective page.

	Enthusiast Interfaces ISO-9141 only (KKL)  Work fine with most cars, but not as fast, or as compatible with "difficult" control modules as our Professional-Grade Interfaces Professional Interfaces ISO-9141 (KKL) plus CAN  Instant Connection Speed,  Fastest Sample Rates, Greatest Compatibility with "Difficult" Control Modules Also available in a Pro-Kit   KEY-COM KEY-USB HEX-COM+CAN HEX-USB+CAN   Connector on PC Serial USB Serial USB Recommended for Professional Use No No YES YES Supports latest cars which require a direct CAN connection No No YES YES Enhanced protocol timing, compatible with 1991-1994 Audi 1Z TDIs and 1993-1994 2.6L V6. No No YES YES (when used with Windows XP) Field Upgradeable Firmware in Interface No No YES YES "Turbo" Mode for Measuring Blocks on newer KWP-2000 ECU's No No YES YES Use with dual K-Line  (2002+ Audi A4, A6 models) YES YES YES YES Acts as a "dongle" for VAG-COM,  No "Software Activation"  required. YES YES YES YES Protection from the "Aftermarket Radio Problem" YES, Electronic YES, Electronic YES, Electronic YES, Electronic Status/Activity LED YES, Red/Green YES, Red/Green YES, Red/Green YES, Red/Green Price including fully-registered VAG-COM software $229 USD $249 USD $329 USD $349 USD

Audis that require Dual K-Lines: All B6/8E chassis A4's with Xenon headlights. All 2002 and newer A6 models, including the Allroad.

"Difficult" older cars include those with 1991-1994 Audi TDI engines which run the diagnostic protocols at 240 (yes, two hundred forty) bits per second, 1993-1994 Audi 2.6L engines with Hella ECU's, as well as any older car that has the "Check Engine" light connected to the L-Line (check wiring diagrams -- we don't have an exact list).

"Lame Port" laptops include many Compaq Presario Laptops, some Acer models, and some ultra-portable Dell models which have the serial port on a separate port expander. All of our current Interfaces (shown above) work fine with these PC's. Our older ISO-COM (no longer in production) and many third-party interfaces based on opto-couplers do not work with these PC's.

"Tight diagnostic sockets" Some models have very tight trim around the diagnostic sockets. The gap between the trim and the socket itself is so small it is in violation of the SAE J1962 specifications. All of our current Interfaces (shown above) fit fine in these these vehicles. Some of our older interfaces as well as many third party interfaces use OBD-II connectors that do not fit these vehicles well.
US Models: 1996 Audi A4. 1996 and 1997 Audi A6 Sedan, all 1996 and newer C4/4A Chassis Audi A6 (includes 1996 and 1997 Audi A6 Sedan and 1996 - 1998 Audi A6 Avant).
European Models: All B5/8D Chassis Audi A4/S4/RS4. All 1997-2001 B5/3B VW Passat (before facelift). All 1996 and newer C4/4A Chassis Audi A6/S6/RS6.