Your master of the road - MAN errors The first and only mobile application for MAN trucks and buses (including Neoplan) on a mobile phone including all falut codes, deffinitions and abbreviations. Type fault code in app search bar FFR 00647 and find problem or example: EDC 03779-01, search 03779 or EDC 03779 (-01 additional tag meaning you have in the app): Rail pressure: High leakage due to quantity compensation. Enter in search: FFR - Vehicle management computer