2006 BMW M3 Questions

All 2006 BMW M3 Questions

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Has a faulse reading on dash....says it's in neutral but its actually in drive and won't start.
On cold starts knocking sound that seems to emanate from vanos unit.After 5 minutes of driving the sound subsides and hard to detect.Any thoughts?
I WAS TOLD THE ASSEMBLY WAS WEARING OUT AT 30K