Prius V not running right after head gasket replacement

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Bofronado, Jul 14, 2026 at 3:49 PM.

  1. Bofronado

    Bofronado Junior Member

    Joined:
    Apr 19, 2023
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    Location:
    Iowa
    Vehicle:
    2008 Prius
    Model:
    N/A
    I have a 2014 V that needed a new head gasket. I followed a great video that guided me through most of it, but after putting it back together it wasn't running right. I am getting the following codes: P0301, P0031, P0351, and P3191. I am unable to clear any of these codes with a scanner or disconnecting the battery. I was sure I had the timing chain not on correctly, but I was able to verify that it was right by removing the valve cover and the crank pully. Just a a complete loss as the what is going on. It starts and runs but sounds horrible.
     
    #1 Bofronado, Jul 14, 2026 at 3:49 PM
  2. rjparker

    rjparker Tu Humilde Sirviente

    Joined:
    Jun 6, 2008
    11,003
    6,894
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    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Often its a vacuum line not connected such as the pcv or evap. Sometimes its a missing or loose gasket on the egr system. Other times its a disconnected sensor like the maf or the first cat air flow sensor. The #1 ignition coil could have a loose connector or bent pins. Its possible more than one of these things are not right.
     
    #2 rjparker, Jul 14, 2026 at 5:12 PM
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