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O2 Bank 2 sensor question

Discussion in '1st Gen. Tacomas (1995-2004)' started by jammer, Oct 28, 2019.

  1. Oct 28, 2019 at 3:42 PM
    #1
    jammer

    jammer [OP] 2003 Toyota PreRunner 3.4L

    Joined:
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    Ben
    Bentonville, AR
    Vehicle:
    2003 Lunar Mist Tacoma PreRunner 3.4l
    OME Coils/Bilstein 5100's front / 5125's rear 105 Amp Denso Alternator
    I purchased from Amazon the Konnwei KW850 scan tool which I love. I’ll mention that I have no check engine light or pending codes.
    There’s an option to test the O2 sensors. When I select Bank 1, I receive the message “not supported”. When I select Bank 2 a screen is provided but at the bottom states fail.
    I can also do a real time graph of each O2 sensor. Pictures below are at idle. Bank 1 looks like a magnitude 10 earthquake. Bank 2 is flat lined.
    Wouldn’t I receive a code if bank 2 sensor wasn’t working?


    https://www.amazon.com/gp/aw/d/B0749MMXB3?psc=1&ref=ppx_pop_mob_b_asin_title

    63A3ECEE-822A-499B-88EF-8A8C4C45D455.jpg
    356C7465-2CEE-4644-B4A3-4FE64907E1F5.jpg
    66E422A8-1EB6-497E-82A5-E1EBD6994333.jpg
    4C8BDD89-AD3B-49D7-B2A4-66A0D2778F87.jpg
     
  2. Oct 28, 2019 at 5:23 PM
    #2
    cruiserguy

    cruiserguy Well-Known Member

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    Elijah
    SLC
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    2000 ext cab, 2.7L, auto, 4x4
    I think that second sensor actually just reports a simple 1 or 0 to the ECU, that the catalytic convertor worked or it didn't. I'm guessing that's what's going on with the graph. Just a guess
     
    jammer [OP] and Black DOG Lila like this.
  3. Oct 28, 2019 at 5:34 PM
    #3
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Virginia
    Vehicle:
    2003 Tacoma SR5 2.7 5 speed 4WD
    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
    Sensor 1 is an air/fuel sensor which your OBDII is not capable of testing the milliamps used by A/F sensors. The 3.28V is normal for A/F sensor. If you can record real time data while driving and save/post results of screen shots would be more helpful. What is the LTFT???
     
    jammer [OP] likes this.
  4. Oct 28, 2019 at 6:53 PM
    #4
    jammer

    jammer [OP] 2003 Toyota PreRunner 3.4L

    Joined:
    Jan 23, 2014
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    #121272
    Messages:
    1,335
    Gender:
    Male
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    Ben
    Bentonville, AR
    Vehicle:
    2003 Lunar Mist Tacoma PreRunner 3.4l
    OME Coils/Bilstein 5100's front / 5125's rear 105 Amp Denso Alternator
    Great information. Not sure on the LTFT. I’ll have to get out for a drive this weekend. My drive to work is only about 4 miles and it’s mostly city/stop & go.
     

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