Many, many things can cause the check engine lamp to illuminate.  To give
you information that's reasonably specific to your problem, we'll need to
know the trouble code.  Check your receipts to see whether they list the
trouble code (Pxxxx) where x represents a digit 0-9.  If the trouble code
isn't listed, go to your neighborhood AutoZone or AAMCO (or any other
place that advertises they'll read the trouble code for free) and have
them read the trouble code for you.  Then report back here with the
trouble code (the code number itself, not someone's interpretation of what
it means).  

Once we have that information, we can tell you what the code means and
guide you as to what is the appropriate next step.  Sometimes, we can
offer a typical solution, and other times more diagnosis is needed to
determine the specific cause of the issue.

--
Message posted using http://www.talkaboutautos.com/group/alt.autos.hyundai/
More information at http://www.talkaboutautos.com/faq.html