Stereo Issue on 2004 Lexus RX330

My CD player keeps giving me an ERROR 4 code. I can't selecte it from the radio. It reverts back to the radio. Is this a simple fix or should I refer it to a dealer?

Asked by for the 2004 Lexus RX330
It sounds like your stereo needs to be repaired. Since it is a factory system the best thing to do is to have Lexus look at it.