Recently purchased a 2005 Chrysler Crossfire and the owner only had one key fob which is in very bad condition. I purchased a key fob on eBay and took it to a TrueValue hardware store and they cut the blade but it will not unlock my door. Is there a chip or a programming necessary for the blade to work? From what I'm hearing I have to purchase a $581 key fob through Chrysler for it to work. Help!!