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Testing O2 sensor

Discussion in '1st Gen. Tacomas (1995-2004)' started by djohn24, May 24, 2018.

  1. May 24, 2018 at 5:57 PM
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    djohn24

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    djohn24 [OP] Well-Known Member

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    This is a
    $61 234-4189 Oxygen Sensor
    234-4189 sensor. Checking to see if any knows the range it should be reading for a good sensor. My ohms reading is 13.4 which seems kinda high. Hoping someone may know. Thanks!IMG_E1327[1].jpg

    IMG_E1327[1].jpg
     
    djohn24, May 24, 2018
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    qkcam likes this.
  2. May 24, 2018 at 9:07 PM
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    Currygoat

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    Currygoat Well-Known Member

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    Currygoat, May 24, 2018
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  3. May 25, 2018 at 1:46 PM
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    djohn24

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    djohn24 [OP] Well-Known Member

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    Thanks Currygoat! So, I am guessing at 13.4, I have a bad 02 sensor that I just bought new off Amazon.


     
    Last edited: May 25, 2018
    djohn24, May 25, 2018
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  4. May 26, 2018 at 1:27 PM
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    djohn24

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    djohn24 [OP] Well-Known Member

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    Ok, checked the ohms on the existing O2 sensor that is still in the truck. 14.9. So, I am guessing the new one at 13.4 is okay. I am getting the P0136 code and running the truck and putting my hand up by the sensor, I feel a good bit of exhaust air coming out. I believe that is why I am getting the code and the sensor is okay.
     
    Last edited: May 26, 2018
    djohn24, May 26, 2018
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  5. May 27, 2018 at 9:44 PM
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    Currygoat

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    Currygoat Well-Known Member

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    https://www.yourmechanic.com/articl...it-malfunction-bank-1-sensor-2-by-jay-safford

    States that it could be an exhaust leak before the sensor...

    Looking back at the previous post I sent you, I think the guy moved the decimal point incorrectly when writing the post. My take on his post is 8.0-14.0 is ok.... but I dont know the factory spec. So it sounds like your new o2 sensor is operating within the expected ohm limit.
     
    Last edited: May 27, 2018
    Currygoat, May 27, 2018
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  6. Sep 7, 2020 at 11:37 AM
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    yarb71

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    yarb71 Well-Known Member

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    Same here...getting P0136 CEL yet i pull the harness and measure and i show i am getting about 13.6 ohms. No leaks that i can tell or see or feel....
    Can the sensor still go bad and read the right ohms? I dont want to waste the money or fight the nuts if i dont have to.

    IM out of ideas.
     
    yarb71, Sep 7, 2020
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  7. Jul 15, 2023 at 5:47 PM
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    qkcam

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    qkcam Active Member

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    Thank you so much for this post!! I have a 98 Taco and the check engine lean bank P0170 has been on.. thanks to OP posting here and ya all's comments I was able to test the oxygen sensor.. came in at 13.1 ! thank you!
     
    qkcam, Jul 15, 2023
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    Currygoat[QUOTED] likes this.
  8. Oct 18, 2023 at 3:08 PM
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    TDHofstetter

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    TDHofstetter Member

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    Sorry to Lazarus this thread, but... the only valid way to test an O2 sensor is to measure voltage across it with the engine running. That voltage should be between about 100mV when the engine is running very, very lean to about 900mV when the engine is running very, very rich.

    Never try to test an O2 sensor by measuring resistance across it. O2 sensors don't work that way.
     
    TDHofstetter, Oct 18, 2023
    #8

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Denso 234-4189 Oxygen Sensor
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