audio input on 2004 cts
 

Hey, I just bought a 2004 cts and see this audio input and cable next to the ashtray. I have an ipod nano and would like to use it in the car. How do I make the nano compatible with the audio input or "that other cable"?

check engine light coming on off on again
 

The check engine light on my 04 cts came on half way through a 5 hour drive. Went off driving around the following day. Two days later it came back on my that 5 hour drive back home. Still on the next day. I made sure the gas cap is on correctly. Should I wait to see if it goes off again or have the dealer do a diagnostic test? Can an auto parts store do computer diagnotics? Less cost than dealer?