I also have a 96 contour V-6 and the CEL was coming on regularily. Dealer said the code was "left bank lean". Put some fuel injector cleaner in it and now it is fine. Pain in the ass when it comes on as you have to disconect the battery to clear the codes or have the code reader, which I don't. My car also runs fine, 156,000 kms and never been tuned up.