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    2010 Prius – Misfire (Cyl 1 & 3) / P0403 – Head Gasket or EGR?

    Trying to figure out if this is a head gasket or EGR issue. Symptoms: Misfire codes on cylinders 1 and 3 P0403 code (EGR circuit malfunction)...
    Thread by: Hdjdhdh, Apr 16, 2026, 14 replies, in forum: Gen 3 Prius Care, Maintenance & Troubleshooting
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