New Codes after Head Gasket Replacement

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Zack Jones, Aug 27, 2025 at 9:00 AM.

  1. Zack Jones

    Zack Jones New Member

    Joined:
    Jul 28, 2025
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    Location:
    Texas
    Vehicle:
    2013 Prius
    Model:
    Three
    Good Morning, I recently posted about a snapping a MAP sensor bolt, but I wanted to post with background for people to help provide some advice.
    I just finished relaxing a head gasket using the gasket masters videos and @NutzAboutBolts videos, and everything seems like it went great! I just about had the car together and decided I wanted to clean the MAP sensor, but the bolt was seized and I snapped the head off trying to take it off. I thought “well, hopefully it still runs”. I finished putting everything together, added oil and coolant, and put the car into maintenance mode. It ran for about a minute before stalling, and it didn’t sound like it was misfiring. I had my scanner hooked up and it populates the following codes

    P0107 - MAP Sensor Circuit low
    P0351 - Ignition Coil A Primary Control Circuit Open
    P0352 - Ignition Coil B Primary Control Circuit Open
    P0353 - Ignition Coil C Primary Control Circuit Open
    P0354 - Ignition Coil D Primary Control Circuit Open
    P3190 - Poor Engine Power


    Obviously it’s terrifying going through a big repair and seeing MORE codes populate (although to was nice to not see the miss fire code)

    I read that an issue with the MAP can cause the rest of the codes to populate, and was wondering if the snapped bolt could be effecting the MAP sensors ability to read pressure?

    Any thoughts on the codes above, and how I can further fix and trouble shoot this car?

    Thanks for anything you can help with.
     
  2. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    If you think the map is leaking you could just take a little goop with pointy applicator go around base of sensor set in hole with no screws applied allow goop to set then apply the 1 screw gently as to not offset sensor in hole creating flow by .