Advantages of the Audi Advanced Key System Audi offers a variety of convenience features that can make driving more enjoyable. One of these options is the aforementioned key system. It works by using proximity sensors that are located in trunk lids and door handles, paired with key radio pulse generators. https://autolocksmith17482.mdkblog.com/35816516/10-places-that-you-can-find-audi-a3-replacement-key