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Bubbles in coolant system can cause P1121?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Mahal, Aug 11, 2021.

  1. Mahal

    Mahal Junior Member

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    I recently (about 5 months) change the inverter coolant pump on my 2008 prius. And by month ago it starts showing the engine light with P1121 code.

    I was wandering if I didn't bleed the bubbles of the system properly, that could cause the error?

    Also have p0420 for a while, I try to clean the catalyst sensor but it shows the code again. How could I solve that and they could have any relation?



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    #1 Mahal, Aug 11, 2021
  2. ChapmanF

    ChapmanF Senior Member

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    It might be possible for bubbles in the engine coolant system to lead to a P1121—I've never tried that.

    But bubbles in the inverter coolant system cause that code? No. The systems are separate.
     
    #2 ChapmanF, Aug 11, 2021
  3. SFO

    SFO Senior Member

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    How many miles on the vehicle, or the upstream and downstream sensor(s)?

    Are you able to use techstream to diagnose the vehicle?
     
    #3 SFO, Aug 11, 2021
  4. Mahal

    Mahal Junior Member

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    Sorry, which sensor are you asking for?

    I have carista device.
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    #4 Mahal, Sep 23, 2021
  5. SFO

    SFO Senior Member

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    #5 SFO, Sep 25, 2021
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