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Its in the middle of the block and an inch or two down from where the head meets the block. Alternately, You can follow the wire to it, which is clipped in the corner space between the valve cover and the intake manifold (on the passenger's side of the intake manifold and towards the firewall from the valve cover). It should be the only wire on the side leading to the block.

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Q: Where is knock sensor on 02' Mazda-Protege 2.0?
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