Can someone please help me. Last month my factory radio finally died. So I went to the local dealership to get a new one. They sold me one that was for a 99 Elantra with a CD player. It was never used, but they couldn't find the book for it. I asked them if it would work in my car and they said it would. So I did the switch. The radio itself works fine, however when I tried the CD player it wouldn't take the CD and it gave me ER2 I called the dealership and they said they would have to look at it. But I really don't want to pay for a shop fee if I don't have to. Any advice or anyone go thru this already?