Advantages of the Audi Advanced Key System Audi offers a variety of features for convenience that make time behind the wheel more enjoyable. One of these features is the aforementioned key system. It works by using proximity sensors in trunk lids and door handles, paired with key radio pulse generators. https://autolocksmith84096.frewwebs.com/30790974/20-reasons-why-audi-a3-replacement-key-cannot-be-forgotten