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Third O2 sensor this year.

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 2009Access4x4, Dec 11, 2021.

  1. Dec 11, 2021 at 10:57 AM
    #1
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Hey guys. My truck is spitting a p00138 code again. It's telling me that the bank 1 sensor 2 sensor is bad and this is the third time I've had to replace that sensor in one year. Anyone know why this one keeps going bad?
     
  2. Dec 11, 2021 at 11:05 AM
    #2
    rnish

    rnish Well-Known Member

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    Do you test the sensor when you take it out? How do you know its bad?
     
  3. Dec 11, 2021 at 11:06 AM
    #3
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    No I haven't tested them. The last one was still under warranty. It only took two months for the code to throw again.
     
  4. Dec 11, 2021 at 11:07 AM
    #4
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    I don't have a great place to work on my truck these days so I just changed it last time without testing it. How do you test it?
     
  5. Dec 11, 2021 at 11:08 AM
    #5
    rnish

    rnish Well-Known Member

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    I suspect the sensors are not bad. Something else is going on
     
  6. Dec 11, 2021 at 11:08 AM
    #6
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Any ideas?
     
  7. Dec 11, 2021 at 11:15 AM
    #7
    tirediron

    tirediron Well-Known Member

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    Based on the symptoms, a corroded connection in the harness somewhere seems likely.
     
    Raylo and 2009Access4x4[OP] like this.
  8. Dec 11, 2021 at 11:15 AM
    #8
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    What's the fix? Do I need to replace the harness or even the harness mount?
     
  9. Dec 11, 2021 at 11:17 AM
    #9
    Bishop84

    Bishop84 Well-Known Member

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    If B1S2 keeps triggering its usually the upstream a/f sensor giving wrong readings.

    It's complicated but its common on Toyotas. Harnesses or wiring is not common, but a possibility.

    If you have the freeze frame of the error share the voltage of b1s1 and b1s2.

    It's 100% not b1s2 thats established.
     
  10. Dec 11, 2021 at 11:19 AM
    #10
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Ok. I'll try and get the voltage. If not the harness then what's the next possibility?
     
  11. Dec 11, 2021 at 11:22 AM
    #11
    Bishop84

    Bishop84 Well-Known Member

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    B1S1

    Edit, to be clear, what side of the truck is the sensor you changed?
     
  12. Dec 11, 2021 at 11:23 AM
    #12
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    I replaced that one, 1 year ago as well. It was a bitch to remove and we had to retap the threads
     
  13. Dec 11, 2021 at 11:35 AM
    #13
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Both passenger side. Upstream and downstream
     
  14. Dec 11, 2021 at 11:38 AM
    #14
    Tacoma Mike

    Tacoma Mike 48 Year Chrysler/Toyota/ASE/ Master Tech.RETIRED

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    Very Good
     
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  15. Dec 11, 2021 at 4:14 PM
    #15
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    I don’t have the right reader to get the voltage
    I don’t have the right reader to be able to see the voltages. I took these pictures of the harness.
    D86837CD-CCAD-425F-8244-44839D61C691.jpg

    66EE0984-C128-4F7A-99C2-C4ECDC95A794.jpg
     
  16. Dec 14, 2021 at 9:37 AM
    #16
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Do you know what type of reader I need to get to be able to record the voltage at the sensors?
     
  17. Dec 14, 2021 at 9:41 AM
    #17
    Wattapunk

    Wattapunk Stay lifted my friends !

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    OP, are the sensors OEM denso brand? Using any other ones from a local parts store is likely your issue.
     
  18. Dec 14, 2021 at 9:42 AM
    #18
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    They're denso
     
  19. Dec 14, 2021 at 10:01 AM
    #19
    Wattapunk

    Wattapunk Stay lifted my friends !

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    Look into OBD2 scanners that can display O2 sensors voltage.
     
  20. Dec 15, 2021 at 9:20 PM
    #20
    2009Access4x4

    2009Access4x4 [OP] Well-Known Member

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    Well the check engine light turned off. I’m going to clear the code and keep track of how many miles before it comes on again. I guess I’ve bought myself some time for now. It’s officially an intermittent problem.
     

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