Genuine OEM Volkswagen Alternator Belt Tensioner Pulley, part number 03L145276C. This pulley is a critical component that maintains optimal tension on the alternator drive belt, ensuring the efficient operation of the alternator and other accessory components. It is located within the engine's accessory drive system. Constructed with a durable bearing, it weighs 0.356 kg. Using a genuine OEM pulley guarantees precise dimensions, correct bearing tolerances, and reliable performance, preventing premature belt wear and system failures.