*(618) 622-9001 Auffenberg Hyundai in O'Fallon is a premier auto dealership serving St. Louis, Belleville, and Collinsville. Whether you're looking for a new or used vehicle, we stock a large inventory of both and our experienced sales department is prepared to help you shop for the right vehicle for your specific needs. We have a selection of all of the most popular Hyundai models, including the Sonata, Santa Fe, and Tucson.