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There are two knock sensors located under the midpoint of the heads, under the center spark plug, partially coverd by a heat shield. They are screwed in vertically and must be accessed from below. WARNING: Before you remove a knock sensor, the engine must be cold and cooling system properly drained. Steam or hot coolant can cause severe injury and burns - coolant is toxic.

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Q: Where is the knock sensor located on a 2004 impala with a 3800 ENGINE?
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