The second-generation Mazda 3 Mk2 (BL) (2009–2016) was Mazda’s well-regarded family hatch and saloon, sold with a broad spread of petrol and diesel engines before the SkyActiv era fully took over. Service it and a handful of electronic counters expect clearing. The oil service reset turns off the maintenance message on the dash once fresh oil is in. A TPMS reset relearns tyre pressures after a rotation where monitoring is fitted, the brake pad wear warning needs clearing when new pads go on, and a steering angle calibration follows alignment work. Disconnecting the 12V battery resets the clock, audio and idle learn. Choose the reset routine that matches your Mazda 3 from the procedures listed directly below.