The risks of driving a Volkswagen car with an Ignition Coil problem include engine misfire, rough engine idle, decreased fuel efficiency, and increased emissions. An ignition coil is an important component in your car’s ignition system that helps to convert the 12-volt current from the battery to the thousands of volts required to create a spark to ignite the fuel-air mixture in the combustion chamber. If the ignition coil is faulty, there can be insufficient spark created to ignite the fuel, resulting in engine misfire, decreased fuel efficiency, and increased emissions. Additionally, when the car is in operation, the engine may run rough and vibrate because of the misfire due to the faulty ignition coil.