OK - I bought a 2004 6s for my son. I'm sure I will drive it some too. It is fully loaded with leather, roof, pretty much everything except one thing odd. The previous owner (2 owners according to Carfax) only has 1 normal key. How can I tell if this car is equipped and used to have remote keyless entry? If so, how expensive is it to get the remotes and have them programmed? Thanks.