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02 sensor replacement

Discussion in '1st Gen Tundras (2000-2006)' started by Fltplanner, Dec 9, 2019.

  1. Dec 9, 2019 at 4:53 PM
    #1
    Fltplanner

    #1
    Fltplanner [OP] New Member

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    I need to pass emissions. ENG LITE IS ON. Due to 02 sensor .
    How can you tell if its upstream or downsteam and where are they on a 2003 Sr5
     
    Fltplanner, Dec 9, 2019
    #1
  2. Dec 9, 2019 at 5:31 PM
    #2
    FirstGenVol

    #2
    FirstGenVol Check the name tag. You're in my world now.

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    Wouldn't the code help you identify the correct one?
     
    FirstGenVol, Dec 9, 2019
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    Aerindel likes this.
  3. Dec 9, 2019 at 5:33 PM
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    Aerindel

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    Aerindel New Member

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    Yes. The code will tell you exactly what O2 sensor it is.

    Although it may very well not be the sensor but the Cat if its a downstream one.
     
    Aerindel, Dec 9, 2019
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    BubbaW likes this.
  4. Dec 9, 2019 at 6:05 PM
    #4
    Fltplanner

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    Fltplanner [OP] New Member

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    Screenshot_20191209-185925_Gallery.jpg
     
    Fltplanner, Dec 9, 2019
    #4
  5. Dec 9, 2019 at 7:37 PM
    #5
    Aerindel

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    Aerindel New Member

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    Up stream, passenger side.

    Screen Shot 2019-12-09 at 8.35.55 PM.jpg
     
    Aerindel, Dec 9, 2019
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    Fltplanner[OP] likes this.
  6. Dec 9, 2019 at 9:16 PM
    #6
    Fltplanner

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    Fltplanner [OP] New Member

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    That schematic is awesome thank you
     
    Fltplanner, Dec 9, 2019
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  7. Dec 10, 2019 at 5:23 AM
    #7
    BubbaW

    #7
    BubbaW Times Change

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    Bank 1 = driver side(left)
    Bank 2 = passenger(right)
    Sensor 1 = upstream
    Sensor 2 = downstream

    With those particular codes, I would take a look at the connectors and wiring of cam/crank sensors seen in @Aerindel drawing !
     
    Last edited: Dec 10, 2019
    BubbaW, Dec 10, 2019
    #7
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