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O2 sensors

Discussion in '1st Gen. Tacomas (1995-2004)' started by Famouskmksrh26, Feb 16, 2010.

  1. Feb 16, 2010 at 10:53 PM
    #1
    Famouskmksrh26

    Famouskmksrh26 [OP] Active Member

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    im tyring to find out how many 02 sensors my 03 has i know i have two that are out but how many are there total and where is the cheapest place i can get em
     
  2. Feb 16, 2010 at 11:02 PM
    #2
    PacNWgen1

    PacNWgen1 NewHere

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    Not sure how many there are? But i just saw some OEM(Denso's) on EBay. Wish I had checked I just spent 290 at the Stealership.
     
  3. Feb 17, 2010 at 4:17 AM
    #3
    Janster

    Janster Old & Forgetful

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    TWO......

    Before the CAT (up near the manifold) and another one after the CAT.

    [​IMG]

    [​IMG]
     
  4. Feb 17, 2010 at 5:00 AM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Denso 234-9001 = Front
    Denso 234-4189 = Rear

    I highly recommend avoiding anything but Denso. Denso is the OE for Toyota's. Avoid universals also.

    You can can get them at either if these places

    www.urdusa.com
    www.rockauto.com
     
  5. Feb 17, 2010 at 7:04 AM
    #5
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Yep, got mine at rockauto.com, and there farely easy to install to. And for the rear O2, there are 2 different ones, make sure to get the one that is longer in length with the connector.
     
  6. Feb 17, 2010 at 5:00 PM
    #6
    shitroc

    shitroc Master of War

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  7. Feb 18, 2010 at 4:36 PM
    #7
    Famouskmksrh26

    Famouskmksrh26 [OP] Active Member

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    Thanks guys i pericate it i really do
     
  8. Feb 20, 2010 at 3:48 AM
    #8
    krlang

    krlang NewEnglander

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    I have replaced my rear O2 sensor twice, once because it failed, the second time because it was incorrectly reinstalled during a muffler replacement.

    I bought this one the second time.

    http://www.amazon.com/gp/product/B000C91HX8/ref=oss_product

    The first one failed at 65k or so, giving me an engine light
    I replaced the original one with that same walker aftermarket unit I bought locally for $85

    I had the muffler replaced back in December, the parts store was out of the gaskets and said they would send one up the next day. The guy at the shop didnt wait for the new gasket, put it on with the old one, cracked both ears and sent me on my way. The next day I got a rear O2 sensor code. :(

    I bought the new sensor, got under my truck, saw the mess, took me a while to remove the rotten gasket off of the flange, installed the new one and things are all back to normal.
     
  9. Mar 4, 2010 at 7:11 AM
    #9
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    I know this is an older post but is it true replacing these will help gas mileage. Im at 240k are they due for a change?
     
  10. Mar 4, 2010 at 7:19 AM
    #10
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Yes it can improve mpgs. And If they havent been changed I would def. do so! They could be all fould up and not working correctly, and still not through a CEL.
     
  11. Mar 4, 2010 at 7:28 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Replace the front one(s).
     
  12. Mar 4, 2010 at 1:28 PM
    #12
    shitroc

    shitroc Master of War

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    the front one seems to have more of an impact on your mpgs, it is also the more expensive one to
     
  13. Mar 4, 2010 at 5:46 PM
    #13
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    But Ive heard you should replace both at the same time bc one will read differently then the other.
     
  14. Mar 4, 2010 at 6:04 PM
    #14
    shitroc

    shitroc Master of War

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    yah youre probably right there, my front one went on me, now im dealing with the CEL being on because of the rear one. I ordered a URD rear o2 sensor simulator tonight to fix that little problem. The simulators are a plug and play setup now,no more splicing.
     
  15. Mar 4, 2010 at 6:39 PM
    #15
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    let me know how the install goes man. im planning on trd headers eventually....but in the meantime, im prolly gonna delete the catalytic converter and had planned on getting the rear o2 sim.
     
  16. Mar 5, 2010 at 1:28 PM
    #16
    shitroc

    shitroc Master of War

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    yah no problem, hopefully itll be in sometime next week. shipping kinda takes a little long when shipped up to canada.
     
  17. Apr 3, 2010 at 8:39 PM
    #17
    bwilliamson

    bwilliamson Well-Known Member

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    I need to replace my rear sensor but for the life of me cant figure out how to get the old one off. Do i need to drop the muffler to get it out or what? There is just no why that I can see other than that to get the nuts off
     
  18. Apr 3, 2010 at 8:52 PM
    #18
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Get the nuts off, and then fallow the wires up to the connector. And there is a little tab on the top that you need to push in on and then wiggle it out. It took some muscle to get mine off. What year/engine do you have?
    Oh and the connector will/should be under your passenger seat.
     
  19. Apr 4, 2010 at 5:39 AM
    #19
    Janster

    Janster Old & Forgetful

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    1st gen ? 3.4L? Manual? (02 sensort 2?)
    http://www.lieblweb.com/o2replacement.html

    I had to open up the shifter boot (manual) to get in there to unplug it - if I can remember correctly, been many years since I did it.
     
  20. Apr 4, 2010 at 8:38 PM
    #20
    bwilliamson

    bwilliamson Well-Known Member

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    I wish it was that easy. The sensor it self has a heat shield (im guessing) on it. This shield is on the side thats most accessible. cant get any tool or can of pb blaster for that matter to work on it. Im seriously thinking im gonna have to drop the exhaust just to change it out.
     
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