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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 at 4:43 PM.

  1. Hopeful Prius repair

    Hopeful Prius repair New Member

    Joined:
    Apr 13, 2024
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    Location:
    Amarillo, tx
    Vehicle:
    2007 Prius
    Model:
    N/A
    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 at 4:43 PM
  2. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    6,358
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    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    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 at 9:28 PM
    Brian1954 likes this.
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