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I had same problem on my N54. There is a O-ring that you want to check and make sure is there. My guess is they did some work on your car and forgot to put it back. Happened to me at the dealership, the boost leak made a mess of my engine right by the throttle body.
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2007 335i sport sedan fully loaded, fmc, downpipes, PTF custom tune. Sold
2012 X5 50i fully loaded. ESS TUNE
2017 X5 M Donington Grey
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