Hello Stacy, I own a Sony CDX-5080 am/fm/CD player in my SAAB. I am trying to avoid installing and re-wiring a newer unit, therefore I have purchased three used, identical, inexpensive units on eBay and I get the same error code on all four units. It is E-04. It seems too coincidental that all four have the same error code. Any suggestions? Thanks, Jon

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