Genuine OEM Audi Crankshaft Speed Sensor Ring, part number 038105189B. This critical component provides precise rotational speed data to the crankshaft sensor, essential for accurate engine timing and fuel injection. It is typically mounted on the crankshaft or flywheel assembly. Weighing 0.175 kg and measuring 0.15 m in diameter, this metal ring ensures exact signal generation. Using a genuine OEM sensor ring guarantees factory-specified tooth profiles and material composition for reliable and accurate engine management.