Injen said that they fixed the problem. Problem is, they didn't. You will still get a CEL regardless of what you do, and unless the light bothers you, there's really no problem at all. I ordered an Injen on Christmas eve, but I didn't get a call until last Saturday saying "yeah they're in but we cant get rid of the CEL". I already bought an AEM. It doesnt look as good, but its totally functional with no CEL.