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  1. Dumb question

    E39 M5 and E52 Z8 Discussion
    Embarking on an upgrade of the nav and sound system...a well worn path I know. A really dumb question for which I couldn’t find a clear answer. If you go full aftermarket, do you lose OBC capability in the dash as well? Like miles to empty or consumption? Or is it only on the head unit...
  2. Reifenkontr.inaktiv on Cluster LED

    E39 M5 and E52 Z8 Discussion
    So when I first start my car I am seeing "Reifenkontr.inaktiv" on the cluster LED bar. I assume its German, but what does it mean? I looked up the cluster tests here Exploring the E39 OBC and ran Test 10: Country coding; Its set to 02 US so I'm not sure why it would be displaying German for...
  3. Onboard Computer/Nav System not booting

    E39 M5 and E52 Z8 Discussion
    When turning on the ignition, the computer screen is not booting. It displays the warning message, and when I attempt to push the round button to "accept," to go to the main menu, the screen shuts off and tries to re-boot, over and over again. It also resets if I don't do anything. Anyone else...
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