Genuine OEM Volkswagen Impulse Rotor, part number 03H105189A. This impulse rotor is a component of the crankshaft assembly, designed to provide a precise signal for engine timing and management systems. It is mounted on the crankshaft, rotating with it to allow sensors to accurately track engine speed and position. The precise machining and material composition of genuine OEM parts are crucial for maintaining correct engine timing and preventing internal damage. This part is essential for smooth engine operation and optimal performance.