The fifth-generation Audi A4 Mk5 (B9/8W) (2015–Present) sits on the MLB Evo platform with Audi’s Virtual Cockpit and a deep suite of driver-assistance electronics across the Saloon and Avant. That depth means several systems expect resetting after maintenance. The oil service reset and the separate inspection counter are cleared through the MMI/driver display once fresh oil is in. Owners also perform a TPMS reset to relearn tyre pressures, a brake pad wear sensor reset when the pads are renewed, and steering angle calibration following alignment or suspension work. A replacement 12V battery must be registered so the charging strategy treats it correctly. Choose the service reset procedure that fits your A4 from the list shown directly below.