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I'm confused (among other things)

Discussion in '1st Gen. Tacomas (1995-2004)' started by elkshedz, Feb 14, 2015.

  1. Feb 14, 2015 at 7:15 AM
    #1
    elkshedz

    elkshedz [OP] Taco lover

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    I recently ordered, received, and installed an o2 sensor from RockAuto, part number DEN 234-4162, what I understand as the downstream sensor. I need to replace the upstream sensor (the longer one) as well but can't understand how to order it when both upstream and downstream sensors are listed together on the website.

    98 Taco Automatic 3.4L V6

    Thanks

    From the site:

    DENSO Part # 2344162 More Info {#8946509020, 8946509140, 8946509190, 8946509210, 8946509220, 8946509310, 8946509320, 894650C200, 8946539735, 8946539835, 8946539865, 8946580034} OE Style; Includes Gasket One of our most popular parts
    Upstream; Automatic trans.; DENSO is the O.E. Manufacturer / Oxygen Sensor
    Downstream; 4WD; Automatic trans.; DENSO is the O.E. Manufacturer / Oxygen Sensor
     
  2. Feb 14, 2015 at 7:20 AM
    #2
    Janster

    Janster Old & Forgetful

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    Have you tried going to Denso website and cross referencing the part numbers?
     
  3. Feb 14, 2015 at 7:23 AM
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    KdF

    KdF Old Rednek Type

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  4. Feb 15, 2015 at 8:05 AM
    #4
    elkshedz

    elkshedz [OP] Taco lover

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    The following are the replies I got back from RockAuto. I thought the upstream sensor was longer but I may be mistaken. Anyone have a '98 Taco that has done this?

    Good morning,

    Thank you for the follow up. The part would be a universal part which will work in either the upstream or downstream position, usually you have to splice out the plug. If you want a direct fit you will need to order a part that is listed as upstream only.

    Thank you,

    Ashley
    RockAuto Customer Service


    AND...


    If you wanted to get another Denso, this would be the part number for the Upstream:

    1998 TOYOTA TACOMA 3.4L V6 : Emission : Oxygen Sensor Price
    DENSO Part # 2344162
    {Click Info Link for Alternate/OEM Part Numbers} OE Style; Includes Gasket One of our most popular parts
    Upstream; Automatic trans.; DENSO is the O.E. Manufacturer / Oxygen Sensor
    Downstream; 4WD; Automatic trans.; DENSO is the O.E. Manufacturer / Oxygen Sensor Part Image $44.79

    Thank you,

    Cody
    RockAuto Customer Service
     
  5. Feb 15, 2015 at 8:33 AM
    #5
    Janster

    Janster Old & Forgetful

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    I've done it on my 96 many years ago....
    http://www.lieblweb.com/o2replacement.html

    I ordered OEM parts from Toyota. I didn't want to mess with aftermarket 'surprises' - and now I know exactly why. Toyota says one thing and Denso says another.....

    According to this Toyota site (OEM parts) - a 3.4L Auto trans 4WD Front & Rears have different part numbers.
    http://www.toyotapartznet.com/parts...d=840&vehicleid=84925&section=EMISSION SYSTEM
    Front: 8946539835
    Rear: 8946539735
    However:
    Denso's website lists the same part numbers for both.
    http://densoautoparts.com/find-my-p...ls=1037&engines=8218%7C968%7C1012&part[]=o2sn
    234-4162
     
  6. Feb 15, 2015 at 9:36 AM
    #6
    elkshedz

    elkshedz [OP] Taco lover

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    Yep, and this is why I'm confused. One part number or two?
     
  7. Feb 15, 2015 at 9:50 AM
    #7
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

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    Are you 4x4?

    Here's the upstream O2 sensor I ordered from Rock Auto for my 98 V6 4x4 5-speed manual (can't remember if the auto or manual makes a difference)

    1998 TOYOTA TACOMA 3.4L V6 DOHC
    DENSO 2344161 (234-4161) Oxygen Sensor $ 48.79 $ 0.00 1 $ 48.79
     
    Wulf likes this.
  8. Feb 15, 2015 at 3:10 PM
    #8
    DrZ

    DrZ Well-Known Member

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    Sounds like the difference is the wire connector. Upstream and downstream (and possibly manual versus manual trans, and 4WD/RWD) have different connectors, but the sensors themselves are the same. If you get a universal sensor that you have to splice in yourself, then the connector doesn't matter, so the part number will be the same.
     
  9. Feb 16, 2015 at 12:30 PM
    #9
    elnip

    elnip Well-Known Member

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    The difference between the two part #'s is only the wire length. I switched the two during troubleshooting my FTC years ago and never switched them back.
     
  10. Feb 17, 2015 at 2:49 PM
    #10
    elkshedz

    elkshedz [OP] Taco lover

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    So do you know how I would go about ordering the sensor with the longer wire? There is no differentiation on the RockAuto website. Did you order a Denso from them as well?
     
  11. Feb 17, 2015 at 2:51 PM
    #11
    elkshedz

    elkshedz [OP] Taco lover

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