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Where is the Knock sensor in a 2000 GMC Sierra?

There are two knock sensors in the V8 engine of a 2000 GMC Sierra. Each sensor is located on the driver's side of the engine block. The front sensor is located at the top of the block, just below the cylinder head, and the rear sensor is located at the bottom of the block, just above the oil pan. Both sensors are attached to the block by a single bolt.