Sensor (Knock) (Not Shown – Located on Left Side of Engine)Specifications Item Description This knock sensor monitors engine detonation and sends signals to the engine control module to optimize ignition timing on JLG 450AJ and 450A aerial work platforms. The sensor is located on the left side of the Kubota engine block within the Engine Components assembly. This replacement part is compatible with machines in serial number range 0300201991 through 0300241743 and other applicable ranges. Skyworks is an