Genuine OEM Audi Spark Plug, part number 101905631A. This essential component is responsible for igniting the air-fuel mixture within the engine's combustion chambers, initiating the power stroke. It features a robust metal and ceramic construction, designed for high-temperature and high-pressure environments, and weighs approximately 0.047 kg. Using a genuine OEM spark plug ensures precise electrode gap, correct heat range, and optimal ignition timing, which are crucial for engine performance, fuel efficiency, and emissions control.