The Mercedes C-Class brings genuine luxury and a cabin full of technology to the compact executive class, with Mercedes’ ASSYST service-management system at its heart. That system schedules maintenance dynamically and must be reset after each job. Owners typically perform an oil service reset via ASSYST, clear the service-due display, run a TPMS reset after fitting tyres, and reinitialise the windows following a battery disconnect. Mercedes evolved the cluster and infotainment menus across the W204, W205 and W206, so each generation has its own steps. Choose your C-Class production years below for the correct instructions.