Genuine OEM Audi Pressure Sensor, part number 8S0959121A. This critical component is designed to accurately detect and measure pressure changes within a vehicle's fluid lines, often found in systems like air conditioning or braking. It is typically installed directly into a hose or pipe. Weighing 0.164 kg, genuine OEM sensors provide precise calibration and signal characteristics, which are essential for the correct operation of safety and control systems.