Genuine OEM Audi Tensioner Pulley, part number 05A109224C. This part functions as a pulley within the engine's belt tensioning system, ensuring the serpentine belt maintains the correct tension for optimal accessory drive. It is part of the belts, chains, and tensioners system. This pulley weighs approximately 0.0308 kg. Genuine OEM pulleys are manufactured with precise tolerances for smooth rotation and durability, preventing premature wear and noise.