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Get thee to a dealer. I had one go, they just replace it. It is an expensive part, but I assume you are still under warranty.
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'05 E90 325i 6sp Man SG 118,032km on the odo (retired)
'06 E90 325i Step SG 121,021km on the odo (retired)
'08 E90 325i LCI Step | Space Grey | Black/Burr Walnut | Adaptive Xenons with HBA | CA | Navi Pro | 17in mixed tyres | 105,437 on the odo 
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