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I looked into this couple of years as my one is 2011 with the Performance pack from BMW, I believe a date exist, i.e. the N47 engines produced before mid 2011, my one was June 2011 so assumed good but you never know.
I also will love to know how to identify the issue, I am at 120k km.
If you serach this forum arround 2011 few posting with details, but if you in doubt take it to your main dealer and ask for the check to be doucmented for future records.
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