1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site
    Quick Links: Can trapped air bubbles after a coolant flush, cause loss of power? [Solved but Unrelated] HELP, anyone know gauge of wires U Joints for a '96 4x4 Front sway bar end links AC/Heater smell my Taco has a bad smell when I'm at idle or at stop light... My OBD2 won't communicate with my truck but Autozone's does

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

    #1
    Miamiguy [OP] Member

    Joined:
    Aug 22, 2019
    Member:
    #303021
    Messages:
    13
    Gender:
    Male
    First Name:
    Shawn
    Vehicle:
    2000tacomav6
    Stock
    how many O2 sensors does my 2000 Tacoma pre runner have its v6
     
    Miamiguy, Sep 12, 2019
    #1
  2. Sep 13, 2019 at 12:52 AM
    #2
    Wyoming09

    #2
    Wyoming09 Well-Known Member

    Joined:
    Apr 24, 2015
    Member:
    #153833
    Messages:
    14,277
    Gender:
    Male
    New Tripoli Pa
    Vehicle:
    2000 Work truck 5 speed 4x4 3.4
    Super Springs
    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
    #2
  3. Sep 13, 2019 at 4:05 AM
    #3
    Miamiguy

    #3
    Miamiguy [OP] Member

    Joined:
    Aug 22, 2019
    Member:
    #303021
    Messages:
    13
    Gender:
    Male
    First Name:
    Shawn
    Vehicle:
    2000tacomav6
    Stock
    I’m in Miami so I’m going guess it just has the 2 sensors
     
    Miamiguy, Sep 13, 2019
    #3
  4. Sep 13, 2019 at 4:08 AM
    #4
    mwrohde

    #4
    mwrohde Well-Known Member

    Joined:
    Mar 12, 2014
    Member:
    #125160
    Messages:
    1,062
    Gender:
    Male
    First Name:
    Matt
    Sugar Hill, GA
    Vehicle:
    2003 Tacoma 4x4 5-speed 3.4 TRD SR5
    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
    #4
  5. Sep 13, 2019 at 12:34 PM
    #5
    Wyoming09

    #5
    Wyoming09 Well-Known Member

    Joined:
    Apr 24, 2015
    Member:
    #153833
    Messages:
    14,277
    Gender:
    Male
    New Tripoli Pa
    Vehicle:
    2000 Work truck 5 speed 4x4 3.4
    Super Springs
    California Emissions Trucks were sold all over The Country
     
    Wyoming09, Sep 13, 2019
    #5
  6. Sep 14, 2019 at 5:42 AM
    #6
    sgtnewundies

    #6
    sgtnewundies Well-Known Member

    Joined:
    Apr 2, 2014
    Member:
    #126843
    Messages:
    649
    Gender:
    Male
    First Name:
    Eric
    Florida, Citrus County
    Vehicle:
    14 trd sport red
    Working on it now....UNDER CONSTRUCTION
    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
    #6
  7. Sep 14, 2019 at 5:47 AM
    #7
    TacoJohn4x4

    #7
    TacoJohn4x4 Captain Save-A-Ho

    Joined:
    Jul 10, 2018
    Member:
    #258956
    Messages:
    1,028
    Gender:
    Male
    Central Valley
    Vehicle:
    2002 Tacoma DC 4x4
    Are we still talking about a 1st gen Tacoma?
     
    TacoJohn4x4, Sep 14, 2019
    #7
    Wyoming09 likes this.
  8. Sep 14, 2019 at 5:54 AM
    #8
    sgtnewundies

    #8
    sgtnewundies Well-Known Member

    Joined:
    Apr 2, 2014
    Member:
    #126843
    Messages:
    649
    Gender:
    Male
    First Name:
    Eric
    Florida, Citrus County
    Vehicle:
    14 trd sport red
    Working on it now....UNDER CONSTRUCTION
    Last edited: Sep 14, 2019
    sgtnewundies, Sep 14, 2019
    #8
  9. Sep 14, 2019 at 6:05 AM
    #9
    TacoJohn4x4

    #9
    TacoJohn4x4 Captain Save-A-Ho

    Joined:
    Jul 10, 2018
    Member:
    #258956
    Messages:
    1,028
    Gender:
    Male
    Central Valley
    Vehicle:
    2002 Tacoma DC 4x4
    TacoJohn4x4, Sep 14, 2019
    #9
    Wyoming09 likes this.
  10. Sep 14, 2019 at 6:15 AM
    #10
    sgtnewundies

    #10
    sgtnewundies Well-Known Member

    Joined:
    Apr 2, 2014
    Member:
    #126843
    Messages:
    649
    Gender:
    Male
    First Name:
    Eric
    Florida, Citrus County
    Vehicle:
    14 trd sport red
    Working on it now....UNDER CONSTRUCTION
    Search Results:
    2002 Toyota Tacoma V6 3.4L
    Part/Stock # Engine Qty Notes
    Air Fuel Ratio Sensor
    $146 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles
    234-9001
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Note:
    Auto Trans
    Label:
    OE Style
    Position:
    Upstream
    View
    Buy
    $170 234-9003 Air Fuel Ratio Sensor
    234-9003
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Note:
    Manual Trans
    Label:
    OE Style
    Position:
    Upstream
    View
    Buy
    Oxygen Sensor
    $61 234-4189 Oxygen Sensor
    234-4189
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Label:
    OE Style
    Position:
    Downstream
    View
    Buy
    $59 234-4206 Oxygen Sensor
    234-4206
    Engine:
    V6 (3.4L)
    CC:
    3378
    1
    Label:
    Universal
    Position:
    Downstream
     
    sgtnewundies, Sep 14, 2019
    #10
  11. Sep 14, 2019 at 6:21 AM
    #11
    TacoJohn4x4

    #11
    TacoJohn4x4 Captain Save-A-Ho

    Joined:
    Jul 10, 2018
    Member:
    #258956
    Messages:
    1,028
    Gender:
    Male
    Central Valley
    Vehicle:
    2002 Tacoma DC 4x4
    o_O
     
    TacoJohn4x4, Sep 14, 2019
    #11
    Wyoming09 likes this.
  12. Sep 14, 2019 at 11:55 AM
    #12
    Wyoming09

    #12
    Wyoming09 Well-Known Member

    Joined:
    Apr 24, 2015
    Member:
    #153833
    Messages:
    14,277
    Gender:
    Male
    New Tripoli Pa
    Vehicle:
    2000 Work truck 5 speed 4x4 3.4
    Super Springs
    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
    #12
    TacoJohn4x4 likes this.
  13. Sep 14, 2019 at 12:42 PM
    #13
    TacoJohn4x4

    #13
    TacoJohn4x4 Captain Save-A-Ho

    Joined:
    Jul 10, 2018
    Member:
    #258956
    Messages:
    1,028
    Gender:
    Male
    Central Valley
    Vehicle:
    2002 Tacoma DC 4x4
    We’re missing out on these unicorns.
     
    TacoJohn4x4, Sep 14, 2019
    #13
  14. Sep 14, 2019 at 12:53 PM
    #14
    sgtnewundies

    #14
    sgtnewundies Well-Known Member

    Joined:
    Apr 2, 2014
    Member:
    #126843
    Messages:
    649
    Gender:
    Male
    First Name:
    Eric
    Florida, Citrus County
    Vehicle:
    14 trd sport red
    Working on it now....UNDER CONSTRUCTION
    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
    #14
  15. Sep 14, 2019 at 1:28 PM
    #15
    mwrohde

    #15
    mwrohde Well-Known Member

    Joined:
    Mar 12, 2014
    Member:
    #125160
    Messages:
    1,062
    Gender:
    Male
    First Name:
    Matt
    Sugar Hill, GA
    Vehicle:
    2003 Tacoma 4x4 5-speed 3.4 TRD SR5
    Why replace both? I just did my upstream, but I didn't do the downstream.
     
    mwrohde, Sep 14, 2019
    #15
  16. Sep 14, 2019 at 2:19 PM
    #16
    sgtnewundies

    #16
    sgtnewundies Well-Known Member

    Joined:
    Apr 2, 2014
    Member:
    #126843
    Messages:
    649
    Gender:
    Male
    First Name:
    Eric
    Florida, Citrus County
    Vehicle:
    14 trd sport red
    Working on it now....UNDER CONSTRUCTION
    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
    #16
  17. Sep 14, 2019 at 2:20 PM
    #17
    LukeCC

    #17
    LukeCC Well-Known Member

    Joined:
    Mar 13, 2017
    Member:
    #213229
    Messages:
    2,445
    Gender:
    Male
    First Name:
    Luke
    Southern California (East County)
    Vehicle:
    2002 LT DCSB
    Upstream and a downstream
     
    LukeCC, Sep 14, 2019
    #17
To Top