The LCD meter and the controller for the electric part of the DYZ model e-bike are professionally customised by Trafly's engineers to solve the fault codes of the e-bike, if the e-bike you bought from Trafly's shop has a fault code that reports an error, please tell Trafly's after-sales staff first, and the final result will be that the after-sales staff will let you know whether or not you need to buy these items