The knock sensor on a Daewoo Matiz 800 SE is typically located on the engine block. Specifically, it is usually located near the cylinder head or in the intake manifold. The exact location may vary slightly depending on the year and model of the vehicle. To locate the knock sensor, you may need to consult the owner's manual or factory service manual for your specific vehicle. In general, the knock sensor is a small, usually round sensor with a single wire connector and is bolted onto the engine block or intake manifold.