The second-generation BMW 1 Series, comprising the F20 five-door and F21 three-door, ran from 2011 to 2019 and remained rear-wheel drive, a hallmark that set it apart from its front-drive successor. Managed by BMW’s Condition Based Service logic, the BMW 1 Series F20/F21 (2011-2019) tracks maintenance electronically and needs those service counters reset after the work. Common procedures include the engine oil service reset, the brake-fluid and microfilter CBS items, and a brake pad wear reset together with the wear sensor. Fitting a new battery requires registration through the power-management module so charging recalibrates, while a steering angle reset follows alignment and a TPMS reset re-baselines tyre monitoring. Choose the 1 Series reset routine you need from the procedures listed below.