One problem related to check engine light on has been reported for the 2009 BMW 3 Series. The most recently reported issues are listed below.
Car was running very bad both check engine lights came on with one blinking total loss of power. The car was taken to certified BMW dealer who replaced fuel injectors, valve and tuned it up cost 3500 didn't solve the problem they said it's gas to air ratio is not correct the car misfiring on all cylinders the BMW dealer wants to charge me another 1600-2700 dollars to fix it. After picking the car up after the first repaired I was back in 2 days later. Dreyer and reinbold is the dealership.