(1) There is a glitch in the fuel injection control program, and therefore, the injection pipes resonate in the middle rev range, which may cause the pipes to crack. If this problem is left unattended, fuel may leak and mix into the engine oil. If this occurs, fuel will burn inside the cylinders, and as a result of this, the engine will suffer an output power shortage and/or will resonate, and in the worst case, the engine would stall and fail to restart. (2) The air charge pipe of the brake system is not properly secured, and therefore, the pipe may crack due to engine vibration. If this problem is left unattended, the pipe may allow air to escape, in which case the air supply would decrease and air charging time would be longer.