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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

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    Miamiguy [OP] Member

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

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    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
     
    Wyoming09, Sep 13, 2019
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  3. Sep 13, 2019 at 4:05 AM
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    Miamiguy

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    Miamiguy [OP] Member

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

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    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.
     
    mwrohde, Sep 13, 2019
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  5. Sep 13, 2019 at 12:34 PM
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    Wyoming09

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    Wyoming09 Well-Known Member

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    California Emissions Trucks were sold all over The Country
     
    Wyoming09, Sep 13, 2019
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  6. Sep 14, 2019 at 5:42 AM
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    sgtnewundies

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    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
    sgtnewundies, Sep 14, 2019
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  7. Sep 14, 2019 at 5:47 AM
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    TacoJohn4x4

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    Are we still talking about a 1st gen Tacoma?
     
    TacoJohn4x4, Sep 14, 2019
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  8. Sep 14, 2019 at 5:54 AM
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    sgtnewundies

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

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    TacoJohn4x4, Sep 14, 2019
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  10. Sep 14, 2019 at 6:15 AM
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    sgtnewundies

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    sgtnewundies Well-Known Member

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    Search Results:
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    sgtnewundies, Sep 14, 2019
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  11. Sep 14, 2019 at 6:21 AM
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    TacoJohn4x4

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    o_O
     
    TacoJohn4x4, Sep 14, 2019
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  12. Sep 14, 2019 at 11:55 AM
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    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
     
    Wyoming09, Sep 14, 2019
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  13. Sep 14, 2019 at 12:42 PM
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    TacoJohn4x4

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    We’re missing out on these unicorns.
     
    TacoJohn4x4, Sep 14, 2019
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  14. Sep 14, 2019 at 12:53 PM
    #14
    sgtnewundies

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    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
    sgtnewundies, Sep 14, 2019
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  15. Sep 14, 2019 at 1:28 PM
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    mwrohde

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    mwrohde Well-Known Member

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

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    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.
     
    sgtnewundies, Sep 14, 2019
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  17. Sep 14, 2019 at 2:20 PM
    #17
    LukeCC

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    LukeCC Well-Known Member

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    Upstream and a downstream
     
    LukeCC, Sep 14, 2019
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