Hello, I am trying to access the headlight range control (group 55). New to VAG-COM....Audi S4 2005 4.2, manufactured in 2004, VIN waupl68e95a098310. Several questions: 1. What will be better: to buy a USB cable and software ( my laptop has win 7) or to look for a scanner? 2. What protocols should be used with my car: "standard" OBD2 VAG COM or CAN-BUS? 3. May I trust ebay info or should I look for more reliable (= expensive) sources? Many thanks!