They don't just work on VW's. I've used mine on both a Honda and a Toyota.
However, only the VAG-COM software will work with the cable. It has all of the manufacturer's codes built in, so you get way more information than the standard OBDII codes. The cable has a chip inside that the software has to read before it will function.
On the Honda and Toyota, you only get the basics. For example, I had a problem with my VW and plugged the VAG-COM cable in. It read back the error and told me it was a coolant temp sensor that went bad. $20 from VW and I replaced it myself. That cable paid for itself already!
Originally posted by ghettocruzer
I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
opal tech2 also works with VAG software the interface is cheap on ebay and I used it on an Audi A3 and VW without any problems but to get the full use of the software there is a license fee to activate it