How do you change the spark plugs on a 2003 Kia Optima?

on th etop of the motor remove the plastic cover. it will give you access to the coils and plugs. Using a 10mm socket, remove the engine cover. All 4 plugs are in the center of the block. Two are really easy to find, the other two need to be removed after you remove the cover on top. You will need a 10mm socket to gain access to them. Don't forget your extender when changing the plugs.