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Had this on my E60 pre F10, each time it went in, it was working again, and they could find no fault. They told me that in order to trace it, it would need plugging into diagnostics for an hour or too, which wiring looms were checked individually....
...it was out of warranty, so a good excuse to change to F10 !!
What I am saying is, they told me they can trace it to wiring with time.
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