Audi Certified Pre-Owned-- FACTORY WARRANTY FOR 5 YEARS FROM ORIGINAL SALE DATE WITH UNLIMITED MILES!! CARFAX One-Owner. Certified. 2021 Audi A4 45 S line Premium Plus quattro 7-Speed Automatic S tronic, quattro, Black w/Leather Seating Surfaces, 2 Rear USB Charge Ports,... via vAuto, Inc.