Auffenberg Hyundai stocks an inventory of certified pre-owned Hyundai Sonata cars in O'Fallon. This car offers a wide selection of features, the best-rated safety, and dependability. No matter where you're going in or out of O'Fallon, the Sonata will get you there in style. Each of our CPO vehicles are inspected and pass strict quality and safety guidelines before we will make them available for sale. Check out our selection of certified pre-owned Hyundai Sonatas.