There are many crucial parts in your BMW that play a critical role in the running of your car. One such component is the catalytic converter which is responsible for controlling the emission of harmful gases from the car. A malfunctioning catalytic converter can lead to emission test failure and cancellation of your vehicle’s registration. Moreover, failure of the catalytic converter can also adversely impact the functioning of the engine. Have a look at the slide to know the symptoms of catalytic converter failure in your BMW.