My radio is aking for a code

It is the anti-theft code.  Check your owners manual, as the 4 digit code may be written down somewhere by the original owner.  If you can't find the code, you'll need to call a dealer.  If the radio is original, they can look up the code by your VIN number.  Otherwise you'll need to pull the radio out and find the serial number and they can look it up that way.  The dealer should provide this over the phone free of charge.  If they tell you that you have to bring the car in and charge you, then call another dealer.  You enter the code using the station preset buttons 1-6.