2005 with 300k+ miles with the following codes P1122, P0a93, P0420, P0456

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Hopeful Prius repair, Sep 14, 2024.

  1. Hopeful Prius repair

    Hopeful Prius repair New Member

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    My wife just got home and red triangle is on. I read the codes with a WiFi code reader and have what feels like a lot, and things I’ve replaced before.
    I’ve replaced both the inverter coolant pump, and the 3 way coolant pump before. I’ve questioned air bubbles but I’m not certain if it’s that or if I should replace most if not all of the coolant system since I’ve replaced parts of it in the past.

    any ideas or suggests oh where to start would be greatly appreciated. Otherwise I’ll listen for bubbles in the inverter coolant reservoir


    P0420
    Catalyst System Efficiency Below Threshold

    P0456
    Evaporative Emission System Leak Detected (very small leak)

    P1122
    Manufacturer Defined

    P0A93
    Manufacturer Defined
     
    #1 Hopeful Prius repair, Sep 14, 2024
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    The P0A93 is the inverter cooling system fault. It's most often caused by the electric pump failing. If you've replaced it previously, then you're familiar with it. It should be considered a wear item similar to a timing belt and expect to replace it every 80-100k miles. If you used an aftermarket amazon or ebay pump instead of a Toyota pump expect to replace it every 10 miles to 50k miles, as their reliability is sketchy at best.
     
    #2 TMR-JWAP, Sep 14, 2024
    Brian1954 likes this.
  3. Hopeful Prius repair

    Hopeful Prius repair New Member

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    Thank you for your response. I didn’t consider this part being something to treat like routine maintenance.
     
    #3 Hopeful Prius repair, Sep 14, 2024
  4. TMR-JWAP

    TMR-JWAP Senior Member

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    I currently have 3 actively driven Gen 2s in the immediate family. Although I install new ones on each at time of purchase, I keep an inverter cooling pump on the shelf at all times.
     
    #4 TMR-JWAP, Sep 15, 2024
  5. MAX2

    MAX2 Active Member

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    #5 MAX2, Sep 17, 2024
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