Genuine OEM Audi Engine Detonation Knock Sensor, part number 06E905377J. This sensor plays a critical role in engine protection and performance by detecting harmful engine detonation (knocking) and relaying this information to the engine control unit (ECU). The integrated wiring harness ensures a secure and reliable electrical connection. Choosing genuine OEM ensures precise sensor calibration and signal characteristics, essential for preventing engine damage and optimizing combustion efficiency.