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Code p1121

Discussion in 'Gen 2 Prius Main Forum' started by zeron1982, Jan 22, 2019.

  1. zeron1982

    zeron1982 Junior Member

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    2008 prius has code p1121 so after some research I replaced the water pump/control valve I bought a new one from O'Reilly but after a week the same code came back water level is good, I checked wires they have power and ground good resistance , not sure what the problem is should I be looking or replace any specific fuse or relay ?

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    #1 zeron1982, Jan 22, 2019
  2. SFO

    SFO Senior Member

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    #2 SFO, Jan 23, 2019
    I_auto_know..., Skibob, Raytheeagle and 1 other person like this.
  3. JC91006

    JC91006 Senior Member

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    California has a 15 year/150k miles emissions warranty for this failure p1121

    You are checking the coolant level at the radiator right? Not the overflow tank
     
    #3 JC91006, Jan 23, 2019
  4. zeron1982

    zeron1982 Junior Member

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    Unfortunately this car has 180, miles and yes at the radiator inverter and overflow tank as well coolent levels are fine in all 3 places , any more ideas ?

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    #4 zeron1982, Jan 23, 2019
  5. JC91006

    JC91006 Senior Member

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    Do you have heat? Bleed the system of air?

    I didn't know O'Reilly makes this part, most just use the OEM part from the dealer
     
    #5 JC91006, Jan 23, 2019
  6. zeron1982

    zeron1982 Junior Member

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    Yes I have heat works fine ,
    I replaced the coolant with a vacuum system ,
    And yes O'Reilly got these parts

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    #6 zeron1982, Jan 23, 2019
  7. JC91006

    JC91006 Senior Member

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    Only advice left is to cycle the chrs pump but it seems there shouldn't be air in there. Maybe bad part.

    Hoses are correct, not mixed up?
     
    #7 JC91006, Jan 23, 2019
  8. zeron1982

    zeron1982 Junior Member

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    Hose connections good I marked them twice ,
    What I also noticed is the check engine light comes back days or a week after I reset it ,
    So I was wondering is there a specific fuse or relay related to this part ?

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    #8 zeron1982, Jan 23, 2019
  9. SFO

    SFO Senior Member

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    What are you reading the stored DTC(s) with?

    Those tank outlet temperature sensors can go bad, try doing a search if needed.
     
    #9 SFO, Jan 23, 2019
  10. JC91006

    JC91006 Senior Member

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    All the information is in post #2, additional areas to check
     
    #10 JC91006, Jan 23, 2019
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