Apparently BMW has known about an issue with the fuel pump on their N54 twin turbo engine (335i and 135i) which causes the car to go into limp mode for two years. They chose not to act on the issue till a recent ABC(America) expose.
http://www.caradvice.com.au/86979/bmw-135i-335i-n54-engine-in-litigation-over-fuel-pump-issue/
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http://www.caradvice.com.au/86979/bmw-135i-335i-n54-engine-in-litigation-over-fuel-pump-issue/
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