How To Install And Activate Ross-Tech VCDS (VAG-COM) OBDII Dongle idog | June 19, 2015 | 2,051 views One of the reasons I like Audis is because I can get an OBDII dongle from Ross-Tech to scan and do things with my Audis. The price of the dongle should be built into the cost of getting an Audi IMO. This is how I set mine up, very straight forward.