It is NOT necessary to be so far-fetched. Due to disarmament, a sensor, a bad connection or anything similar may fail. The fact of plugging it into the computer and seeing how all the sensors report is a security issue to prevent you from returning the next day claiming something that maybe, could be detected at the time. In cars with more technology than the JOY, even to change a brake pad you must notify the ECU, otherwise it will fail.