I just had my vehicle cylinder head done today and I took my vehicle down to emission testing and they told me I had to do some research about how to reset my computer because my computer is not hooking up to their computer. What exactly do I need to do to reset the computer on my vehicle. He told me to google it but I don't know the specifics to google. I am from Nashville, Tennessee. My vehicle is 2000 Ford Expedition 5.4 4WD.