Genuine OEM Audi Pressure Differentiator, part number 058906051G. This critical sensor is designed to precisely measure and compare pressure levels within various vehicle systems, such as the intake, exhaust, or fuel system, providing essential data to the engine control unit. It is typically located on the right side of the vehicle. This small, yellow-housed component ensures accurate readings for optimal engine performance and emissions control. Choosing a genuine OEM pressure differentiator guarantees exact calibration, signal characteristics, and durability, which are vital for maintaining engine efficiency and preventing diagnostic issues.