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Car has code PO325

This is a discussion on Car has code PO325 within the General Help forums, part of the LSx Technical Help Section category; Knock sensor circuit. It sucks that it is under the intake. I need to invest in a GM service manual ...

  1. #1
    Junior Member tc86gn's Avatar
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    Leesville,Louisiana
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    Black
    2002 WS6 T/A

    Car has code PO325

    Knock sensor circuit.

    It sucks that it is under the intake. I need to invest in a GM service manual and diagnostic/tuning equipment.

    I bought this 02 brand new. The first new car I ever bought. And now the first problem w/it. It is bone stock no mods w/ 37,000 on it.

    I am not too familiar yet with OBDII systems and have no scan tool for OBDII.

    I now need to invest in something and start learning about this cars systems and tuning it.

    I am open to all suggestions and opinions on a one time purchase on the diagnostic/tuning equipment I will need to keep this car running great w/ a few mods in the future. I don't want to waste my money on something that I don't need or won't perform satisfactorily.

    Keeping a GN running good costs enough already!

    Great site and thx in advance for any suggestions.
    02 WS6 Black (Stock)

    86 Buick Grand National

  2. #2
    Junior Member tc86gn's Avatar
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    2002 WS6 T/A

    Also would like to know what seems to be the most common diagnosis for this code.

    Thx.
    Tom

  3. #3
    Junior Member
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    Schenectady, NY
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    Red
    1999 Camaro Z28

    I get these after washing my engine. It goes away after 30 warm up cycles. There is a TSB on this showing how to put a dam of silicone around the front of the sensors to keep water out. I haven't washed my engine now for a few months because I didn't want any codes to cause me to not pass my inspection. No codes have come up. Inspection passed. Time to wash that puppy.

    I do not recall the TSB number.

  4. #4
    Junior Member
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    ST.PETERSBURG FL
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    PEWTER
    2001 TRANS AM WS.6

    In time washing will corod the knock sensors it happened to mine i found the tsb printed it out and took it to the dealer. i was out of warrenty by 400 miles but they did what they call a good someritan repair and covered it anyway it cost me a $107.00 you can do it your self but the senors and gasgets will cost more than that they also replaced the harness that goes to the knock sensor. and told me no more high pressure washing of the engine. it's worth a shot. BRING THE TSB WITH YOU

  5. #5
    Junior Member tc86gn's Avatar
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    2002 WS6 T/A

    Thanks guys. I do wash my motor and try to keep it clean. I never would have thought about that.

    Will try the warm up cycle procedure and go from there.

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