Genuine OEM Audi NOx Sensor With Control Unit, part number 05L907807CD. This integrated assembly precisely detects nitrogen oxide levels in the exhaust gases and incorporates a control unit to manage related emissions functions. It is typically installed in the exhaust system, providing critical data and processing for the engine management system. Weighing approximately 0.206 kg, this compact unit measures 0.16m in length. Using a genuine OEM NOx sensor with its integrated control unit ensures accurate readings, correct signal processing, and seamless communication with the vehicle's ECU, which is paramount for maintaining emissions compliance and optimal engine operation.