P0300, P0301 and P0302 codes, with no funny noises from engine

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Thatswhathappens, Jun 19, 2023.

  1. Thatswhathappens

    Thatswhathappens New Member

    Joined:
    Jun 19, 2023
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    Location:
    Charlotte NC
    Vehicle:
    2012 Prius
    Model:
    Five
    2012 with about 130K miles. As the title says, all three codes were showing but I’m not hearing anything funny coming from the engine, sounds as it normally does.

    I’ve found plenty of threads on this, but they usually note an audible rattle/knock and I’ve got nothing out of the ordinary from the engine here. Should I start with the plugs or check something else to see where the problem might be?
     
    #1 Thatswhathappens, Jun 19, 2023
  2. Paladain55

    Paladain55 Active Member

    Joined:
    Oct 20, 2021
    388
    153
    0
    Location:
    The South
    Vehicle:
    2010 Prius
    Model:
    Two
    Considering a p0301 and a p0302 almost always result in head gasket failure you should immediately quit driving it, pull the plugs for inspection and replacement, and start testing for a blown head gasket. Maybe if you cross your toes you will avoid head gasket failure.
    The knock is the house and the house always wins.
     
    #2 Paladain55, Jun 19, 2023
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