Auffenberg Hyundai has a large inventory of certified pre-owned Hyundai Sonata sedans in O'Fallon. This mid-size car has a wide selection of add-ons, top-rated safety, and dependability. This sedan makes an instant impression with its edgy exterior and a bespoke interior, crafted with premium materials. All of our CPO vehicles are thoroughly inspected to meet strict safety and quality guidelines before we make them available for sale. Browse through our inventory of certified pre-owned Hyundai Sonata vehicles.