I just bought a 2004 crossfire coupe (105K) here in Chicago about 3 weeks ago and experienced similar problems with the tire pressure warning and engine warning light. when I bought it I took it to a Firestone and they said it does not show any codes. I am currently looking for a good and cheap mechanic in the Chicagoland area that can fix my rear brakes and front ball joints. Please let me know if you guys have any good suggestions on affordable tires and rims as I am looking to replace them sooner rather than later. I am so happy that I was able to purchase this dream car for an affordable price and can't wait to make some everlasting memories in this incredible vehicle.