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Can I get away without Toyota parts for plugs, injectors, or coils?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriusPaddler, Nov 11, 2024 at 4:57 PM.

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  1. PriusCamper

    PriusCamper Senior Member

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    Throttle body replacement is the only known repair method for Throttle body position sensor, because there's no way outside of the factory to calibrate if you just swapped the sensor.

    Sounds to me like there's no new problems with your car, just same problem you had before with unstable idle and you'll likely find P1121 again. Just put in another used throttle body from the wrecker. It's just some plug, nuts, bolts, clips, very easy job....
     
    #21 PriusCamper, Nov 12, 2024 at 4:55 PM
  2. dolj

    dolj Senior Member

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    ... and of course, the correct cookie cutter text for a P1121 is Coolant Flow Control Valve Position Sensor Circuit Stuck.

    There are plenty of posts in the Gen 2 forum about that, some of which will have the repair manual except for how to troubleshoot and repair this problem.

    This code will be set if any of the following conditions are detected:
    • Water valve position sensor output voltage:
      • No change despite the ECM sending a valve control signal or slow response
    • CHS tank outlet temperature sensor output:
      • 60°C (140°F) or more (when hot coolant recovery starts)
    • CHS tank outlet temperature sensor output:
      • No change despite the hot coolant being recovered
     
    #22 dolj, Nov 12, 2024 at 8:26 PM
    Last edited: Nov 12, 2024 at 8:38 PM
  3. ChapmanF

    ChapmanF Senior Member

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    Oh heck, was this another of the "somebody googled a P1 (manufacturer defined) code and got the meaning it has in some other model of car" stories?
     
    #23 ChapmanF, Nov 12, 2024 at 10:36 PM
    PriusPaddler likes this.
  4. PriusPaddler

    PriusPaddler Member

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    Yep. Been there done that 3x. The shop read the 1121 incorrectly because they didn't look it up for a prius.Specifically , so they replaced that position sensor needlessly.
     
    #24 PriusPaddler, Nov 15, 2024 at 1:10 PM
  5. PriusPaddler

    PriusPaddler Member

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    Yes!! But that is old news except that they replaced the wrong part which means that part is relatively new for my car And not likely to be the issue today.
     
    #25 PriusPaddler, Nov 15, 2024 at 1:11 PM
  6. PriusPaddler

    PriusPaddler Member

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    I have a lot going on at the moment with A family farmhouse and auction.

    Left my car at a Shop this morning telling them about the codes and the last time plugs were replaced.

    They just called and said plugs were bad and are now replaced car is done. But then added that I was a bit low on coolant!!!

    My son noticed that two or three weeks ago.. Doesn't that mean it has to be a head gasket?

    Aaaaargh. Even if it runs smoothly now, Why else would I be a little low on coolant so quickly?

    I'm tempted to call them back and ask if they even tested for a head gasket issue...
     
    #26 PriusPaddler, Nov 15, 2024 at 1:15 PM
    Mendel Leisk likes this.
  7. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Sounds like The Three Stooges Garage...
     
    #27 Mendel Leisk, Nov 15, 2024 at 2:33 PM
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