In my humble opinion, for a DSM, CEL = now your making more power Anyway, if you have the NT version, you can just do the resistor mod to get rid of the light. There's a link, I believe, at neons.org or you can check 2gnt.com for further details. Oh yeah, mine threw a CEL and am too lazy to do the mod, then again, my CEL represents like 5-6 codes :o