I've got a CEL on my 96 Accord @ 208k miles... needs EGR valve/ports cleaned. I'd do that while you're at it, doesn't hurt... especially if it's never been done (such as the case on my car.) Replacing the O2 sensors and doing a tune-up are also good maintenance and should resolve whatever is throwing a code. Either EGR flow, O2 sensor or a misfire would be my top guesses (and are the most common). If it was anything worse or other than those, the car would likely be having noticable drivability problems. Good luck, keep us posted.