No catalyzer + faulty o2 sensor

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

  1. Hakam

    Hakam Junior Member

    Joined:
    Jul 31, 2022
    14
    3
    0
    Location:
    Jordan, Amman
    Vehicle:
    2008 Prius
    Model:
    II
    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

    Joined:
    Jun 22, 2021
    1,808
    513
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    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

    Joined:
    Mar 16, 2009
    1,132
    513
    0
    Location:
    Saskatchewan, Canada
    Vehicle:
    2008 Prius
    Model:
    Base
    #3 alftoy, Jul 31, 2022
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,155
    50,598
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    how many km on her? maybe the engine and battery need work
     
    #4 bisco, Jul 31, 2022
  5. Hakam

    Hakam Junior Member

    Joined:
    Jul 31, 2022
    14
    3
    0
    Location:
    Jordan, Amman
    Vehicle:
    2008 Prius
    Model:
    II
    Engine is new and the battery has 2 faulty cells. Despite that, i am only getting 22mpg
     
    #5 Hakam, Aug 4, 2022
    bisco likes this.
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,155
    50,598
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    are any of the brakes dragging?
     
    #6 bisco, Aug 4, 2022
    Prius Rising likes this.
  7. Boblay

    Boblay Junior Member

    Joined:
    Jul 30, 2022
    6
    3
    0
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    Four
    Good question
     
    #7 Boblay, Aug 5, 2022
  8. Hakam

    Hakam Junior Member

    Joined:
    Jul 31, 2022
    14
    3
    0
    Location:
    Jordan, Amman
    Vehicle:
    2008 Prius
    Model:
    II
    No. But my abs system isn't working
     
    #8 Hakam, Aug 5, 2022
  9. Another

    Another Senior Member

    Joined:
    Jun 22, 2021
    1,808
    513
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    How do you know (only) two cells are faulty?
     
    #9 Another, Aug 5, 2022
  10. Hakam

    Hakam Junior Member

    Joined:
    Jul 31, 2022
    14
    3
    0
    Location:
    Jordan, Amman
    Vehicle:
    2008 Prius
    Model:
    II
    It undergone a battery check in a car shop
     
    #10 Hakam, Aug 5, 2022
  11. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,155
    50,598
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    must be the catylizer and the o2 sensor then
     
    #11 bisco, Aug 5, 2022
  12. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    10,096
    4,827
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    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

    Joined:
    Jun 22, 2021
    1,808
    513
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    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
(You must log in or sign up to post here.)