Genuine OEM Volkswagen Spark Plug, part number 101905610A. This critical component is responsible for igniting the air-fuel mixture within the engine's combustion chambers, initiating the power stroke. It is installed in the cylinder head, typically one per cylinder. Weighing approximately 0.05 kg, this spark plug is engineered for precise fitment and electrical conductivity. Using genuine OEM spark plugs ensures correct heat range, electrode gap, and material composition for optimal engine performance, fuel efficiency, and longevity.