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rear o2 sensor - DONE!

Discussion in '1st Gen. Tacomas (1995-2004)' started by bowyer2002, Feb 26, 2011.

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  1. Mar 3, 2011 at 8:45 AM
    #21
    shocker01

    #21
    shocker01 Well-Known Member

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    From what I understand about it, it is either working or not, atleast the style that is on our trucks.
    I just had to change the primary O2 on mine. You can run a test on the sensor with a multimeter. Take an ohm reading between the two black wires. Bank 1 sensor 1 on a 1gen should read between 0.8 and 1.4 ohms. My replacement one read 1.2 and the old one that was throwing the code had no continuity between them. Just a quick tip to pass on.
     
    shocker01, Mar 3, 2011
    #21
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  2. Mar 3, 2011 at 8:48 AM
    #22
    vantaco

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    vantaco Well-Known Member

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    good idea, where's the connector for the primary? is it easily enough to find when i crawl under the truck or is the connector hidden some where?

    thanks
     
    vantaco, Mar 3, 2011
    #22
  3. Mar 3, 2011 at 9:01 AM
    #23
    shocker01

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    shocker01 Well-Known Member

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    The wires that are coming off of the sensor itself is where I took the readings. Just unplug the sensor and test it at the connector.
     
    shocker01, Mar 3, 2011
    #23
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  4. Mar 3, 2011 at 9:36 AM
    #24
    bowyer2002

    #24
    bowyer2002 [OP] always tinkering

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    AMAZON.COM - good luck!
     
    bowyer2002, Mar 3, 2011
    #24
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  5. Jun 20, 2011 at 9:17 AM
    #25
    s1deout

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    s1deout Active Member

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    Just did this to mine this weekend. Rear O2 sensor was throwing a CEL and the nuts were a pain to get off.

    Good advice: Spray with liquid wrench or wd40 for a couple days before attempting.

    Question: Where can I get one of those o2 sensor shields?
     
    s1deout, Jun 20, 2011
    #25
  6. Jun 20, 2011 at 11:19 AM
    #26
    kmok

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    kmok Plastidipped ma Hootus!

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    Rust is definitely a pain in the ass. On my brother's 97 4runner it threw a CEL and it was the rear o2 sensor. I crawled under the 4runner to see how hard it would be to change. Underneath the 4runner I found the o2 sensor just dangling there hanging by the wires, the bolts completely rusted through letting the o2 sensor come out :eek:
     
    kmok, Jun 20, 2011
    #26
  7. Jan 12, 2012 at 1:19 AM
    #27
    JT1521

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    JT1521 Well-Known Member

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    I need to replace the Downstream Oxygen Sensor bank 1 sensor 2 on my 2003 Toyota Tacoma 4WD as well. I crawled under the truck and saw that heatshield blocking the view of the sensor. Is there noway to take that shield off without cutting it? That seems kind of stupid that they would make them that way knowing that at some point the sensor will have to be replaced. There has to be a way to take it off and put it back on.
     
    JT1521, Jan 12, 2012
    #27
  8. Jan 12, 2012 at 2:23 AM
    #28
    Rusty 06 4x4

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    Rusty 06 4x4 NBHNC

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    nice write up
     
    Rusty 06 4x4, Jan 12, 2012
    #28
  9. Jan 12, 2012 at 5:56 AM
    #29
    bowyer2002

    #29
    bowyer2002 [OP] always tinkering

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    If you only cut it enough to bend it out of the way and not totally off, you can reinstall it and bend the shield back into it's original position. (see the 3rd picture at the beginning of this post) This is what I did instead of an expanded metal 'one off' shield design, I got lazy.
     
    bowyer2002, Jan 12, 2012
    #29
  10. Jan 12, 2012 at 12:54 PM
    #30
    JT1521

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    JT1521 Well-Known Member

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    If that is what you did then that picture looks confusing. lol Picture 3 looks like you completely cut the shield off. Then you took the left side of the shield and it is just hanging from the right side.
     
    JT1521, Jan 12, 2012
    #30
  11. Jan 14, 2012 at 9:50 AM
    #31
    JT1521

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    A guy at my mom's work who is also a mechanic on the weekends told her would do it. I will buy the part and let him install it. He told her its easy and only a 10 minute job. I laughed at that. You really have no idea how long something is gonna take especially with rust and corrosion. Maybe it will take him 10 minutes to do but I highly doubt it would have only taken me that long. lol Before I order the part. Denso Part # 2344189 is a perfect fit correct? It says OE next to it. However, it does not say OE Direct Fit. Should I save 25 bucks and go with the OE one or get the OE Direct Fit? Stupid questions I know.
     
    JT1521, Jan 14, 2012
    #31
  12. Jan 19, 2012 at 4:13 PM
    #32
    JT1521

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    Anyone know if the replacement nuts M8 X 1.25 13mm are the same for a 2003 Tacoma? Are they a lock nut or just a regular hex nut? Just curious. Thanks.

     
    JT1521, Jan 19, 2012
    #32
  13. Jan 19, 2012 at 5:53 PM
    #33
    ruler1

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    ruler1 stump thumper

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    I just ordered two from rockauto.com. Shipped it was 125 bucks and much much cheaper than local parts stores. I will let you know how the install goes.
     
    ruler1, Jan 19, 2012
    #33
  14. Jan 24, 2012 at 5:28 PM
    #34
    bowyer2002

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    bowyer2002 [OP] always tinkering

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    I just put regular nuts on mine, along with some anti-sieze compound, just in case.
     
    bowyer2002, Jan 24, 2012
    #34
  15. Mar 6, 2012 at 3:10 PM
    #35
    Ishter

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    Ishter Member

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    Thread is only a little old at this point but, question:

    The bolts holding my rear o2 sensor have no nuts at all. Pulled out of a traffic circle and exhaust gets real loud and sounds like crap. A little looking around finds the sensor hanging loose next to the exhaust. Both bolts are completely corroded with no signs of any nuts working themselves of recently. Is there a preferred method to clean up the studs to accept new nuts or completely replace studs?
     
    Ishter, Mar 6, 2012
    #35
  16. Mar 8, 2012 at 6:35 PM
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    JT1521

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    JT1521 Well-Known Member

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    Completely replace the studs. I had to on mine.


     
    JT1521, Mar 8, 2012
    #36
  17. Mar 9, 2012 at 2:16 AM
    #37
    RacerP

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    RacerP Well-Known Member

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    I did this operation a couple of months back. Ordered both front and rear for my '03 from RockAuto.

    Here in Chicago dealing with the typical rust issues...front one was easy enough to do myself. The rear was a whole different story. After an hour or so of trying to dick around with it...ended up taking it to a muffler shop and paid them $40 cash to install it.

    Money well spent.
     
    RacerP, Mar 9, 2012
    #37
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  18. Mar 10, 2012 at 4:02 AM
    #38
    Ishter

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    Ishter Member

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    I used hose clamps. That sucker ain't moving now.
     
    Ishter, Mar 10, 2012
    #38
  19. May 3, 2012 at 7:26 PM
    #39
    takaya49

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    takaya49 Pacific Rim Mushrooms

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    Fox C/O long travel shox with resi, piggy back fox rears, TC UCA's, ICON AAL, Addicts/17 toyo MT, Mr. Marv set up,
    Where did you order yours?


     
    takaya49, May 3, 2012
    #39
  20. May 3, 2012 at 11:29 PM
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    SCSPerformance

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    SCSPerformance, May 3, 2012
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