I was driving on the highway, at approx 74mph, then traffic suddenly stopped. I stopped as slowly as i could, but it was still rather quickly. probably 74-0 in under 8 seconds. Anyway, right after i stopped CEL came on. It stayed on for the 200 or so miles i had left to get home. This was yesterday. It was on this morning driving to work, and again home from work, and again to class ... but when i left class it was off. SHould i be concerned or take it in to find out why the CEL came on?