2005 Jeep Liberty Question: Bought a 2005 jeep liberty which had a aftermarket auto start installed. I only

recieved 1 key for the vehicle and was told the other keys chip was used for the auto start unit. I am now tring to find a cheap way to get another key. I bought on ebay a slug which is programable but you need 2 keys. I tried it with the instructions using the auto starter as the second key and it did not appear to work. Is the chip from the first key used in the auto start fobe unit or is it somewhere in the vehicle. Hence if it is in the vehicle do i really need a programable key? Thanks for sharing