The BMW X3 is one of the most sought-after luxury car in its segment due to its performance and advanced features. However, despite these features drivers have often complained about the air filter in the BMW X3 malfunctioning. The air filter is responsible for preventing the entry of dirt and debris into the engine of the car. There are certain signs that reveal that the air filter has failed. Go through the video to know the 3 signs of a malfunctioning air filter in your car.