HELP, where to start - P0420, P1116, P1150, B1421 & B1475

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by AzNative73, Feb 28, 2025 at 5:38 PM.

  1. AzNative73

    AzNative73 New Member

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    Hello! I have been a lurker for many years, thought I had an account, but it said not. But anyway, I have always loved how much info is shared here without making someone feel inadequate. :) Which brings me to my issue. I have a 2006 Touring with 285k miles on it, and last week I was driving back from getting dinner and my check engine light and red triangle came on, then went away, then came on again, and went away. I parked it and read my codes today with Techstream and got the following codes. P0420, P1116, P1150, B1421 & B1475. I know sometimes one can be due to the other, so I am wondering where do I start? I have replaced the inverter pump 3 times in the last 7 years. First time was because I bought it from online, and it failed within months, but the last 2 times have been from Toyota dealership. Last time was 06/24. Where do I start?
    Thank you all in advance!!!!
     
    #1 AzNative73, Feb 28, 2025 at 5:38 PM
  2. dolj

    dolj Senior Member

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    You can ignore the B14xx for now, they are not pressing or relate to the Pxxxx codes.

    The P1116 and P1150 do not relate to the inverter coolant pump. They have to do with the coolant heat recovery system.

    The P0420 relates to the catalytic converter's efficiency. It could be related to the engine not running efficiently, or at least as efficiently as it could.
     
    #2 dolj, Mar 1, 2025 at 12:27 AM
  3. MAX2

    MAX2 Active Member

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    Techstream allows you to read freeze frame data by errors. Have you saved them?
    Errors in the coolant thermos system can cause the check engine light to come on.
    P1150
    https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip1150a.pdf
    P1121
    https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip1121a.pdf
     
    #3 MAX2, Mar 1, 2025 at 4:24 AM
  4. MAX2

    MAX2 Active Member

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    Is the catalytic converter original on the car or replaced?
    P0420 requires a thorough study of the fuel-air mixture problems. It is possible that due to the old catalytic converter and engine, the burning mixture of fuel, air and oil does not turn into an environmentally friendly product at the exit of the catalytic converter.
     
    #4 MAX2, Mar 1, 2025 at 4:26 AM
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