Engine Performance problem
1992 Lexus SC 300 6 cyl Four Wheel Drive Automatic 259000 miles
my car has 259000 miles and the radio doesnt work. Also when im driving there is a little noise that comes from the engine. Something like a long beep that doesnt stop until I turn off the car. I also want to plug in the radio but some guy from best buy told me its not possible. What can I do for all of this?