The Bosch Ignition Coil Service Kit - 140712 is a comprehensive kit of products designed to service the ignition coil of a car. It includes a variety of essential components to ensure proper functioning of the ignition system. The kit contains three main contents: an ignition coil, a spark plug, and a spark plug wire set. These components work together to provide the necessary spark for the car's engine to start and run smoothly. The ignition coil is responsible for converting the battery's low voltage into the high voltage needed to create a spark, while the spark plug and wire set deliver the spark to the engine's combustion chamber. This kit is a convenient and cost-effective solution for maintaining the ignition system of a car.