all you need to do is go to an automotive site like advance auto where they have pictures of your parts. Look up the part you need to replace and print the picture. Take the picture to your car and match up the part. Its EGR. EXHAUST GAS RECIRCULATION valve. Its takes excaping gas and recirulates it so it burns. What happens is the carbon that also leaves your engine gets sucked into the valve clogging it up.