Genuine OEM Volkswagen Spark Plug, part number 101905620. This critical component is responsible for igniting the air-fuel mixture within the engine's combustion chambers, initiating the power stroke. It is installed directly into the cylinder head. Measuring approximately 80mm in length, this spark plug is engineered for precise timing and consistent spark delivery. Choosing genuine OEM spark plugs ensures correct heat range, electrode gap, and material composition, which are vital for efficient fuel combustion, engine longevity, and preventing misfires.