I had the CEL when I bought mine. It was a P0440 code. That was a mega bummer since it's a BS code that can mean about anything! Gas cap I hear being the most common. However, mine was related to a wiring harness issue. A wire that effects the emmissions reporting of some sort had come loose. That's all it was. The shop was able to fix it without me buying the $600 harness thank goodness! It evidently was a bear to locate the issue though!