Two problems related to engine have been reported for the 2009 BMW 335. The most recently reported issues are listed below.
2009 BMW 335i has had engine run at half power numerous times. Only once was it able to be taken to the dealership in time for them to retrieve any diagnostic information and act on it at that point in time, however it has suffered similar behavior since this point and supposedly they are unable to retrieve data, even within a week or two of the event occurring and state that nothing is wrong with it. The first time this happened I was making a left turn and was relying on the acceleration of the vehicle to make a turn at a reasonable speed prior to traffic arriving and the car simply gave out and reduced itself to half power (per the error on the screen). Quite nearly got me in an accident. The fliing date on this is the most recent, to my knowledge, of the incident occurring. I wasn't aware of this site until now so it's possible the date is off by as much as 4-6 weeks.
The contact owns a 2009 BMW 335xi. The contact stated that while driving 50 mph, the vehicle completely lost acceleration power. The contact had to drive at a low speed to reach his destination. The contact turned the vehicle off and restarted; after the restart, the vehicle functioned properly. Within two to three days, the failure occurred again. The vehicle was taken to an authorized dealer where the contact was informed that the turbo high pressure fuel pump needed to be replaced. The vehicle was repaired but the failure continued. There had been no further repairs. The failure mileage was 18,681 and the current mileage was approximately 25,000. Updated 01/28/lj the consumer stated there was a design problem with the fuel pump. Updated 03/23/11.