I changed the spark plugs and wires. I changed the air filter and the oil. What is wrong with my car?

That light can come on for a zillion reasons. Gas cap must be tight, there is a trans sensor that also will trip the check engine light, you can change it by the codes and it still won't stay off. I changed the fluid in the trans at a shop and they bought me a trans. These are funny cars. do the gas cap thing first. Reset it by pulling the fuse and see if it works. It is so strange cause the car probably runs fine!:rofl: