The benchmark compact executive saloon, the BMW 3 Series blends sharp dynamics with a sophisticated electronics package built around Condition Based Servicing. That system tracks each maintenance item individually and must be reset whenever you complete a job. Typical tasks are the oil service reset, resetting CBS items such as brake fluid, microfilter or brake pads, a TPMS reset after fitting tyres, and window reinitialisation following battery work. BMW changed the iDrive menu paths across the E90, F30 and G20, so each generation has its own steps. Select your 3 Series production years below for the matching procedure.