My Scangauge reads the code (which just popped up this am) as a P0672, circuit failure #2 glow plug. The Scangauge won't clear the code though. However I hooked my SCT X3 and it read the code as a P0004 of which I can't find any information on. Don't think such a code even exists, but the SCT cleared the code and turned off the CEL. The P0672 sounds more likely. If indeed thats what it is, should I be concerned?