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If it is a V-8 Then there are 2 of them and they both are underneath the intake manifold.

You will have to remove the intake to even see them.

The V-6 is screwed into the transmission mounting flange on the top left rear corner of the engine just below the oil sending unit. You will have to climb up and lean over the top of the engine to see it. HARD TO SEE.

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Q: How do you locate and change knock sensor on 02 gmc sierra?
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