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There are two knock sensors on the 3.0

The location depends on which year model you have. Best found from underneath.

On the 2002 and 2003, one is on the front of the engine block and the other on the rear. Look underneath the exhaust manifold.

The trouble codes refer to #1 and #2. My guess is that the front one is #1.

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Q: Where is the knock sensor on an 03 Saturn vue 3.0?
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