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

Testing O2 sensor

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

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

    djohn24 [OP] Well-Known Member

    Joined:
    Sep 12, 2014
    Member:
    #138107
    Messages:
    195
    Gender:
    Male
    First Name:
    Dennis
    Pa
    Vehicle:
    03 Double cab SR5 Tacoma 4x4
    This is a 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
     
    qkcam likes this.
  2. May 24, 2018 at 9:07 PM
    #2
    Currygoat

    Currygoat Well-Known Member

    Joined:
    May 8, 2017
    Member:
    #218518
    Messages:
    333
    Bay Area, California
    Vehicle:
    2002 Tacoma 2.4 5 Speed
    Rims, 4600 Bilsteins, K&N filter
  3. May 25, 2018 at 1:46 PM
    #3
    djohn24

    djohn24 [OP] Well-Known Member

    Joined:
    Sep 12, 2014
    Member:
    #138107
    Messages:
    195
    Gender:
    Male
    First Name:
    Dennis
    Pa
    Vehicle:
    03 Double cab SR5 Tacoma 4x4
    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
  4. May 26, 2018 at 1:27 PM
    #4
    djohn24

    djohn24 [OP] Well-Known Member

    Joined:
    Sep 12, 2014
    Member:
    #138107
    Messages:
    195
    Gender:
    Male
    First Name:
    Dennis
    Pa
    Vehicle:
    03 Double cab SR5 Tacoma 4x4
    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
  5. May 27, 2018 at 9:44 PM
    #5
    Currygoat

    Currygoat Well-Known Member

    Joined:
    May 8, 2017
    Member:
    #218518
    Messages:
    333
    Bay Area, California
    Vehicle:
    2002 Tacoma 2.4 5 Speed
    Rims, 4600 Bilsteins, K&N filter
    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
    qkcam likes this.
  6. Sep 7, 2020 at 11:37 AM
    #6
    yarb71

    yarb71 Well-Known Member

    Joined:
    Sep 28, 2016
    Member:
    #198423
    Messages:
    296
    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.
     
  7. Jul 15, 2023 at 5:47 PM
    #7
    qkcam

    qkcam Active Member

    Joined:
    Nov 27, 2019
    Member:
    #311877
    Messages:
    31

    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!
     
    Currygoat[QUOTED] likes this.
  8. Oct 18, 2023 at 3:08 PM
    #8
    TDHofstetter

    TDHofstetter Member

    Joined:
    Jan 23, 2013
    Member:
    #95935
    Messages:
    10
    Gender:
    Male
    First Name:
    Tim
    Bradford, VT
    Color-matched Leer cap
    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.
     

Products Discussed in

To Top