Genuine OEM Audi Engine Valve Spring, part number 022109623H. This precision-engineered coil spring is a vital component within the engine's valvetrain, responsible for controlling the opening and closing of the engine valves. It ensures that the valves return to their closed position accurately and consistently, which is critical for proper engine timing, combustion efficiency, and overall performance. Using a genuine OEM valve spring guarantees the correct spring rate, material fatigue resistance, and dimensions for reliable and long-lasting engine operation.