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Unfortunately, OP's experience is very common. Dealer service departments follow BMW diagnostics procedures and begin to replace parts until the problem is solved. This works for 90% percent of problems covered by warranty. More complex problems require a call to BMW NA and the the process repeats. Approved parts are replaced again.
10% of problems require a different approach where an experienced mechanic uses his / her deep insight to identify a non-prescriptive diagnostic approach.
I always believe that developing a relationship with a local independent shop shortly before the warranty expires is the best investment in reducing future repair costs.
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