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The ignition coil transforms the low voltage from the battery into the high voltage necessary to create a spark at the spark plugs, igniting the air-fuel mixture in the engine's cylinders.

Symptoms include engine misfires, reduced fuel efficiency, difficulty starting the engine, and illumination of the check engine light.

Driving with a faulty ignition coil is not recommended, as it can lead to engine misfires, decreased performance, and potential damage to other engine components.

Replacement intervals vary by vehicle and usage, but it's advisable to inspect ignition coils during regular maintenance and replace them as needed to maintain optimal engine performance.