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Check plugs and coils
I bought a 2014 X3 2.0L with 49K on it. Since they recommend changing plugs at 50K, I bought some Bosch Platinum on Ebay. Changed them and had the same symptoms. No power, no turbo, only drivable by barely nudging accelerator. A friend told me Bimmers are very finnicky for coils and plugs.
I ordered 4 coils and 4 NGK Iridiums from FCP Euro Parts and it solved the problem. Be wary of Ebay plugs.
I should add I own the iCarSoft Scanner and it reported misfire on #1 which sort of pointed me in the right direction. You can find this tool on Amazon or Ebay for around $150 and it's very comprehensive.
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