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No catalyzer + faulty o2 sensor

Discussion in 'Gen 2 Prius Fuel Economy' started by Hakam, Jul 31, 2022.

  1. Hakam

    Hakam Junior Member

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    So i bought this used 2008 prius but i am only getting max 25mpg wich means that each pip goes around 17 miles. I diagnosed it in a workship and no catalytic convertor was there + the o2 sensor needs cleaning. Now some expert told me that first i should but a calatic convertor because it might fix the problem since the o2 sensor is connected to it. The thing is that it is way too expensive so i am planning to buy a copy version of it. Do you think the getting a catalyzer will fix my mileage problem? If not should I put o2 sensors on my top priority?.
     
    #1 Hakam, Jul 31, 2022
  2. Another

    Another Senior Member

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    Or just replace the sensor and put a straight pipe in place of the missing converter
    Options after a CAT theft | PriusChat
     
    #2 Another, Jul 31, 2022
  3. alftoy

    alftoy Senior Member

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    #3 alftoy, Jul 31, 2022
  4. bisco

    bisco cookie crumbler

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    how many km on her? maybe the engine and battery need work
     
    #4 bisco, Jul 31, 2022
  5. Hakam

    Hakam Junior Member

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    Engine is new and the battery has 2 faulty cells. Despite that, i am only getting 22mpg
     
    #5 Hakam, Aug 4, 2022
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  6. bisco

    bisco cookie crumbler

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    are any of the brakes dragging?
     
    #6 bisco, Aug 4, 2022
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  7. Boblay

    Boblay Junior Member

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    Good question
     
    #7 Boblay, Aug 5, 2022
  8. Hakam

    Hakam Junior Member

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    No. But my abs system isn't working
     
    #8 Hakam, Aug 5, 2022
  9. Another

    Another Senior Member

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    How do you know (only) two cells are faulty?
     
    #9 Another, Aug 5, 2022
  10. Hakam

    Hakam Junior Member

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    It undergone a battery check in a car shop
     
    #10 Hakam, Aug 5, 2022
  11. bisco

    bisco cookie crumbler

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    must be the catylizer and the o2 sensor then
     
    #11 bisco, Aug 5, 2022
  12. edthefox5

    edthefox5 Senior Member

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    The hybrid battery modules are in series so only takes one failing module to kill the whole pack.

    you have poor mileage because your hybrid battery is bad. Hybrid battery supply’s most of the power in a Prius.
     
    #12 edthefox5, Aug 5, 2022
  13. Another

    Another Senior Member

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    May want to download Dr Prius app and get more info yourself as you drive. Even the free version is useful.
     
    #13 Another, Aug 6, 2022
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