>I just purchased an Audi A6 2.7T w/ navigation. Unfortunately, the car
> is out of warranty. I am having a problem with the navigation system.
> When I place any of the Navigation CDs in the system, the system is
> returning a "CHECK CD" error. I am sure the CDs are good. Does anyone
> have any suggestions?

It's possibly a CD drive fault. You'd really need specialist help to
diagnose it properly. I believe the Audi units are actually Blaupunkt so it
might be worth talking to a car audio dealer to see if they can help or
recommend a repairer.

Sorry, can't help any more than that.