A vehicle ignition is needed to start the car. It uses an ignition key to start the vehicle and depends on power from the battery to efficiently operate. The ignition is composed of numerous components that are all needed to ensure that the vehicle runs as it should. Any of these components can wear out or need to be replaced at any time. A good auto locksmith can help with many of these components if trouble arises. Components inside of the ignition system include the spark plugs, spark plug wires, the coil, ignition module, rotor, the distributor and distributor cap.