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Advice Needed! P0401, P0300, P0301, P0303 Head Gasket and/or EGR?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by ALTEREG0, Aug 19, 2024.

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  1. ChapmanF

    ChapmanF Senior Member

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    Yes, I'm sure it has something to do with the ECM driving the valve toward closed when the conditions are also very hot and the plastic is soft. In ozmatt's car, the problem began after he made a long, high-speed trip in 40℃ weather.
     
    #81 ChapmanF, Oct 15, 2024 at 5:25 PM
    ALTEREG0 likes this.
  2. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Regarding temps, if the cooler has a good coating of carbon, will it still cool the exhaust gasses sufficiently?
     
    #82 Mendel Leisk, Oct 15, 2024 at 9:22 PM
  3. ALTEREG0

    ALTEREG0 Junior Member

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    I wanted to check the magnet on the EGR valve currently installed in the car which I believe is the original one. Went with the family to get some bobba drinks and to my surprise the CEL had come off.
    The car was in use until now and so the engine is still too hot and I’m too tired to take the magnet off, hopefully I can take the magnet out and compare it to the one for the replacement valve in the pictures. Actually, even better if the CEL doesn’t come on again at all ☺️
     
    #83 ALTEREG0, Oct 16, 2024 at 12:04 AM
  4. ALTEREG0

    ALTEREG0 Junior Member

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    Interesting question, what do you think @ChapmanF?

    If the cooler in my car is squeaky clean (at least for the time being) I would imagine it will cool better preventing the valve from getting as hot as a dirty cooler would.
    The question is, how long will it take for the cooler to start getting “dirty” letting the valve temperature increase?
    Probably have to use the most heat resistant material that I can find to fix the ski slope (ramp) on the magnet…
     
    #84 ALTEREG0, Oct 16, 2024 at 12:24 AM
    Last edited: Oct 16, 2024 at 12:38 AM
  5. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Too bad you can’t just buy the piece with the ramp. Looking on Amayama, for me the full EGR valve is ~$260 (CDN), plus shipping, which’ll like make it close to $300.
     
    #85 Mendel Leisk, Oct 16, 2024 at 6:10 AM
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