Hello I am new to forum. My Genesis zxt 59 powered by the 07' Hyundai engine will suddenly not want to start. It will show a fault code that says " 636 spn 3*04 fmi ". It wont start for a few times then suddenly will start and run perfect like always. It only has 921 hours on it. It has done this when cold and when warmed up. Can someone please point me in the right direction? Could I get from someone what these codes mean? I have owned it since it had 42 hours on it and it is a great unit. Please help me figure this out. Thanks for any help.