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An electronic fix for a P0420 error code

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Georgina Rudkus, Jul 4, 2023.

  1. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I found this video of interesting electronic fix to eliminate the reporting of a P0420 error code on a Honda. I think it might work the same way on a Prius. It might be worth a try for someone who has this issue.

     
    #1 Georgina Rudkus, Jul 4, 2023
    Grit likes this.
  2. Tombukt2

    Tombukt2 Senior Member

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    This was over on toymods years ago before you tube. I've seen it work on a 94 Corolla. And a Camry. Maybe a few variations in the numbers values of the parts
     
    #2 Tombukt2, Jul 4, 2023
  3. Tombukt2

    Tombukt2 Senior Member

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    I am glad you posted this though I need to do this to my '09 and see if this will just eliminate the nonsense going forward I've just been leaving the code It doesn't seem to bother anything and hear where I live they laugh at that light and give you an inspection sticker
     
    #3 Tombukt2, Jul 5, 2023
  4. Paladain55

    Paladain55 Active Member

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    Spark plug anti foulers work great. A lot of the guys who modify 1uz cars (sc400, gs400, ls400) will run the engine in something without catalytic converters and put the 90* brass spark plug anti foulers in and the car thinks everything is good to go, no check engine lights.
     
    #4 Paladain55, Jul 18, 2023
  5. anonymous

    anonymous Member

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    I tried this it did not work. Just use the non-fouler it works
     
    #5 anonymous, Jul 20, 2023
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