The Check Engine Light may illuminate and/or a lack of power may be noted due to a failed high pressure fuel pump. BMW has released a service bulletin regarding this matter, the suggested repair is to replace the failed high pressure pump.
Car problem reports
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Most reported BMW 335xi problems
Aluminum cylinder head bolts may break, most commonly in the front part of the engine. Our technicians tell us revised cylinder head bolts are available which should correct this concern.
One vehicles equipped with power folding mirrors, the mirror may fold out past the standard position. Our technicians tell us that if this occurs a special procedure must be followed to relearn the correct mirror home position.
Air conditioning was not cooling. Had the refridgerant replaced and it worked liked a charm.