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Pressure Converter fixed the problem.
My 2011 335ix recently got the 'Engine malfunction! Reduced power' message from the 2C57 code while accelerating moderately quickly. The car still ran like normal; not in limp mode. Shutting off the car and restarting cleared the trouble but it would come back predictably every time I goosed the throttle beyond a certain point.
From reading this and other posts, I ordered the Pressure Converter which now has part number 11-74-7-649-407. Replacing the part stopped the Engine Malfunction light and message plus the car had a much more spirited response to goosing the throttle. The loss of this power probably happened quite some time before this and perhaps gradually so that I didn't notice it was gone. So glad to have it back!
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