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How many O2 sensors?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Miamiguy, Sep 12, 2019.

  1. Sep 12, 2019 at 7:10 PM
    #1
    Miamiguy

    Miamiguy [OP] Member

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    how many O2 sensors does my 2000 Tacoma pre runner have its v6
     
  2. Sep 13, 2019 at 12:52 AM
    #2
    Wyoming09

    Wyoming09 Well-Known Member

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    Depends if it has the California Emissions package

    The California Package has a Air Fuel Sensor and O2 sensor.

    The Non California has 2 O2 sensors .

    At least when it was sold the first time
     
  3. Sep 13, 2019 at 4:05 AM
    #3
    Miamiguy

    Miamiguy [OP] Member

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    I’m in Miami so I’m going guess it just has the 2 sensors
     
  4. Sep 13, 2019 at 4:08 AM
    #4
    mwrohde

    mwrohde Well-Known Member

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    I think Toyota calls the upstream one an Air Fuel Sensor. My truck isn't a California truck either, and that's what the part was called when I replaced it.
     
  5. Sep 13, 2019 at 12:34 PM
    #5
    Wyoming09

    Wyoming09 Well-Known Member

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    California Emissions Trucks were sold all over The Country
     
  6. Sep 14, 2019 at 5:42 AM
    #6
    sgtnewundies

    sgtnewundies Well-Known Member

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    You should have one o2 sensors and one air/fuel sensors. Air/fuel is forward of cat or upstream and o2 is after cat or downstream. The sensors can degrade over time which will effect performance and gas mileage. The typical code is P0135 I believe. If you replace them do all of them.

    (I corrected my mistake of 2 o2 and 2 air fuel as 1st gens have 1 of each, but verify :) )
     
    Last edited: Sep 14, 2019
  7. Sep 14, 2019 at 5:47 AM
    #7
    TacoJohn4x4

    TacoJohn4x4 Captain Save-A-Ho

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    Are we still talking about a 1st gen Tacoma?
     
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  8. Sep 14, 2019 at 5:54 AM
    #8
    sgtnewundies

    sgtnewundies Well-Known Member

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    Last edited: Sep 14, 2019
  9. Sep 14, 2019 at 6:05 AM
    #9
    TacoJohn4x4

    TacoJohn4x4 Captain Save-A-Ho

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  10. Sep 14, 2019 at 6:15 AM
    #10
    sgtnewundies

    sgtnewundies Well-Known Member

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    Search Results:
    2002 Toyota Tacoma V6 3.4L
    Part/Stock # Engine Qty Notes
    Air Fuel Ratio Sensor
    234-9001
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Note:
    Auto Trans
    Label:
    OE Style
    Position:
    Upstream
    View
    Buy
    234-9003
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Note:
    Manual Trans
    Label:
    OE Style
    Position:
    Upstream
    View
    Buy
    Oxygen Sensor
    234-4189
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Label:
    OE Style
    Position:
    Downstream
    View
    Buy
    234-4206
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Label:
    Universal
    Position:
    Downstream
     
  11. Sep 14, 2019 at 6:21 AM
    #11
    TacoJohn4x4

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  12. Sep 14, 2019 at 11:55 AM
    #12
    Wyoming09

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    Sadly I seem not to have the dual exhaust on my 2000 either

    I still only see two unless your can`t decide if you have the Automatic or Manual Transmission or want the universal one without a plug
     
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  13. Sep 14, 2019 at 12:42 PM
    #13
    TacoJohn4x4

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    We’re missing out on these unicorns.
     
  14. Sep 14, 2019 at 12:53 PM
    #14
    sgtnewundies

    sgtnewundies Well-Known Member

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    Looks like 1 upstream and 1 downstream. I have 4 on my 2014 and my 2008 trucks. My 2003 has 2. Replace both.

    (Corrected my earlier posts)
     
    Last edited: Sep 14, 2019
  15. Sep 14, 2019 at 1:28 PM
    #15
    mwrohde

    mwrohde Well-Known Member

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    Why replace both? I just did my upstream, but I didn't do the downstream.
     
  16. Sep 14, 2019 at 2:19 PM
    #16
    sgtnewundies

    sgtnewundies Well-Known Member

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    The upstream is air fuel sensor, the downstream is an oxygen sensor. Its good practice to replace both at the same time. They tend to effect performance as they age and doing both will make sure the system is operating optimal without one trying to compensate for the other being weaker. The downstream is less money too.
     
  17. Sep 14, 2019 at 2:20 PM
    #17
    LukeCC

    LukeCC Well-Known Member

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    Upstream and a downstream
     

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