This knock sensor from Standard Motor Products is a crucial component for your 2003-2008 Mazda 6. It is designed to detect ignition knocking and provide a reliable signal to the engine control unit. The sensor is compatible with various Mazda 6 models and has a part number of 21272WW. The sensor is made with high-quality materials and has a wire quantity of 2. It is easy to install in the engine compartment and comes with a 12-month warranty. This product is a must-have for any Mazda 6 owner looking to maintain their vehicle's engine performance.