1. Attachments are working again! Check out this thread for more details and to report any other bugs.

2012 Prius - CEL P0301 Cylinder 1 misfire

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by EchoToPrius, Jul 25, 2024 at 2:25 PM.

  1. EchoToPrius

    EchoToPrius Junior Member

    Joined:
    Mar 26, 2013
    31
    9
    0
    Vehicle:
    2012 Prius
    Model:
    Two
    My mechanic performed a compression test and confirmed it was the head gasket. They performed a head gasket sealer which turned off the CEL for one day. The prius still knocks at start and will misfire while accelerating.

    I am looking to make this car last as long as possible in it's current state. I do not want to put anymore money into it. I will only be using it for my daily work commute of 26 miles.

    I have read that taking off both coolant caps and running high heat at start up will help with the drive.

    Is there anything else you can recommend?
     
    #1 EchoToPrius, Jul 25, 2024 at 2:25 PM
  2. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    55,590
    38,742
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Flush out the sealer and replace head gasket.

    Never mind; you don't want to spend any more on it.

    Just postmortem:

    What's the miles?
    EGR system ever cleaned?
     
    #2 Mendel Leisk, Jul 25, 2024 at 2:37 PM
  3. EchoToPrius

    EchoToPrius Junior Member

    Joined:
    Mar 26, 2013
    31
    9
    0
    Vehicle:
    2012 Prius
    Model:
    Two
    324,000. Full EGR assembly was replaced 1 year ago. Spark plugs in March. New tires in December.

    Now you can see why I don't want to spend anymore money on it and want to make it last as long as possible in it's current condition for my daily 26 mile round trip work commute.
     
    #3 EchoToPrius, Jul 25, 2024 at 3:16 PM
    Mendel Leisk likes this.
  4. EchoToPrius

    EchoToPrius Junior Member

    Joined:
    Mar 26, 2013
    31
    9
    0
    Vehicle:
    2012 Prius
    Model:
    Two
    To replace the head gasket, the lowest quote I got, was still more than what the car is worth.
     
    #4 EchoToPrius, Jul 25, 2024 at 3:17 PM
    Mendel Leisk likes this.
  5. Brian1954

    Brian1954 Active Member

    Joined:
    Jan 31, 2021
    836
    312
    0
    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    Run it until a piston rod breaks and puts a hole thru the block and leaves you stranded during your commute.
     
    #5 Brian1954, Jul 25, 2024 at 3:24 PM
  6. EchoToPrius

    EchoToPrius Junior Member

    Joined:
    Mar 26, 2013
    31
    9
    0
    Vehicle:
    2012 Prius
    Model:
    Two
    Now that is solid advice!
     
    #6 EchoToPrius, Jul 25, 2024 at 3:52 PM
(You must log in or sign up to post here.)