Audi A4, S4 (B9) (From 2020) – Fuse and Relay Box Diagram
In this article, we cover the updated Audi A4 and Audi S4 (B9 generation, facelift), produced from 2020 to the present. You will find detailed fuse box diagrams, information about the location of fuse and relay panels inside the vehicle, and a full explanation of each fuse and relay function (fuse layout). This guide is useful for diagnosing electrical issues, replacing fuses, and performing vehicle maintenance.
3 Facts about the Audi A4 / S4 (B9 Facelift)
The 2020 facelift introduced refreshed exterior styling, including new headlights, grille design, and updated LED lighting signatures.
The Audi S4 continues to use a turbocharged 3.0L V6 engine, delivering strong performance with improved refinement and responsiveness.
Interior upgrades include a larger touchscreen infotainment system, enhanced MMI software, and updated driver-assistance features for better safety and comfort.