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Ran the codes on 02 Forester. We came up with P0328 Knock Sensor. I am putting on new fuel filter and plug wires. Does anyone know what voltage I should be pulling off of the knock sensor. Right now it is pulling 1.0 Thanks

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Here's the diagnostic procedure for a P0328 code from the FSM for the 2002 Subaru Forester. I believe it covers everything. Replacing the knock sensor is trivial, and a new one costs about $75.

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The knock sensor Is #5 in the diagram below, you have to remove the air cleaner box to access it. It is bolted to the engine block.

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After the repair, clear the codes - otherwise you'll think it's still broken!

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    Always here to help. @PeteCon
    – Moab
    Commented Jun 24, 2017 at 0:09

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