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Advice Needed! P0401, P0300, P0301, P0303 Head Gasket and/or EGR?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by ALTEREG0, Aug 19, 2024 at 6:50 PM.

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  1. Mendel Leisk

    Mendel Leisk Senior Member

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    ^ worth noting.

    AFAIK NGK were never the stock-from-factory plug. Previous owner replaced, possibly counterfeits?

    I’d still be on alert regarding the head gasket.
     
    #21 Mendel Leisk, Aug 22, 2024 at 6:37 AM
    Last edited: Aug 22, 2024 at 6:42 AM
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