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Sounds like your battery voltage was getting low... a low battery voltage drives these cars crazy and you'll see all manner of codes, errors and gremlins. They all usually go away once the battery voltage recovers (is charged, replaced etc.).
Look at threads where folks are wondering if their alternator is on the way out - similar symptoms.
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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