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The primary function of the ignition coil is to transform the battery’s low voltage (typically 12 volts) into the high voltage required to create a spark at the spark plugs. This high voltage is essential for igniting the air-fuel mixture in the engine’s cylinders, which is critical for engine operation. The ignition coil produces this high voltage and sends it through the high tension wire to the spark plugs, enabling them to generate the spark necessary for combustion.

While regulating fuel flow, controlling engine temperature, and filtering air are important functions in engine operation, they are not roles that the ignition coil plays. Fuel flow is typically managed by the fuel system, temperature regulation is handled by the cooling system, and air filtration is managed by the vehicle's intake system. Thus, the correct identification of the ignition coil’s primary function underscores its crucial role in the ignition system of an engine.