Hyundai Repair: 1999 hyundai accent check engine light, hyundai accent, trouble code

Question
Check engine light just came on, Has 112,500 miles
Still runs good but light stays on can you tell me what to check.  I check to make sure gas cap was on tight.
timing belt was changed at 58,000.

Answer
There are too many thing that could possibly be the issue to check all of them.  You'll need to read the trouble codes to see what type of issue you have.  AutoZone has advertised they'll read the trouble codes for free.  If you can post back with the trouble code, I can give you information on what it means and what to check or repair.