The ignition coil is a central component of the ignition system in gasoline engines. Its job is to convert the on-board voltage of 12 volts into a high voltage of up to 30,000 volts. This high voltage is needed to generate a spark at the spark plug, which ignites the air-fuel mixture in the cylinder. Modern vehicles often use one ignition coil per cylinder, which increases efficiency and reliability. A defective ignition coil can lead to misfiring, loss of power, or increased fuel consumption. Timely replacement is therefore important for trouble-free engine operation.