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Just a quick update - my father's 2011 X3 with the 3.0 N52 engine, 65,000 kms started experiencing drivetrain malfunction issues in December, gone into Limp mode, and CEL light. On moderate throttle the car would start lurching, and on idle I can hear the occasional ping, but driving lightly (simulating Eco mode) it is possible to get speed. It's worse when the engine was cold.
Turned out one of the cylinders was misfiring. Replaced all six ignition coils and spark plugs... about an hour labor at an independent shop. Runs like a champ now. My father even commented that he notices more power, so I assume that this will lead to improved fuel economy.
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