you all really know your stuff! I tightened the cap, but the light was still on. I went to disconnect the battery--and after seeing that intrepid's dont have batteries--oh wait, there it is wayyyyy under there--I noticed that it had a bit too much corrosion--but being that I didnt want to/know how to dismantle my air filter compartment to get to it , I took it in to get a new battery. That essentially reset the computer, and the check engine light is gone. Thanks again for the wealth of info that you all represent!