my check air bag light anf break light is on, what could that be, and what are some prices....and is there a cheap place i can get auto parts for the 2002 kia optima

Actually we have the same problem.The dealer fixed it for me. No charge. They had to do something with the car's computer. I think they had to load new software or program. There's no need to go to shop for the repair. If you have the manual you can find your answer there too. You'r looking for Kia parts right? You should try Ebay, its the best place for inexpensive auto body parts or car parts you need, they have it all. Goodluck

 Also try this:

http://kiaparts.com/

http://www.kia.com/faq.php 

http://www.autopartsfair.com/kia-usedparts/ (used Kia parts)