Ignition coils are crucial components in a vehicle’s ignition system, responsible for converting the battery’s low voltage (12 volts) into the high voltage (often over 20,000 volts) needed to create a spark at the spark plugs. This spark ignites the air-fuel mixture in the engine’s cylinders, enabling combustion and engine operation. Each ignition coil serves one or more spark plugs, depending on the vehicle’s design.

Modern vehicles often use coil-on-plug systems, where each cylinder has its own dedicated coil mounted directly on the spark plug, improving ignition precision and efficiency. When ignition coils start to fail, symptoms may include engine misfires, rough idling, poor fuel economy, difficulty starting and the check engine light turning on. Regular inspection and timely replacement of faulty ignition coils are essential for smooth engine performance and preventing long-term engine damage.