Auffenberg Hyundai stocks an inventory of certified pre-owned Hyundai SONATA cars in O'Fallon. This car has a wide range of add-ons, top-rated safety, and dependability. No matter where you are going in or around O'Fallon, the SONATA will help to get you there in style. Each of our CPO vehicles are inspected and pass several safety and quality guidelines before we will make them available for sale. Search our inventory of certified pre-owned Hyundai SONATAs.