Open your Diagnostic port under the hood and put a jumper wire on the second to last port on the bottom full row and the last port on the middle row. Leave the top row with 4 ports alone. After your jumper the ports together turn your key to the on position but do not start. If it has a code stored your check engine light will make some short and long flashes. Count the flashes and post them here and I will check back and let you know what they are. Axe will probably beat me to it though, he is one of the best here with Kia electronics.

Hope this helps, Dennis

Edit by Damkia: Try this link for a guide
http://www.troublecodes.net/Kia/