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How to replace O2 Sensors

Discussion in '1st Gen. Tacomas (1995-2004)' started by Alderleet, Dec 22, 2011.

  1. Dec 22, 2011 at 4:16 PM
    #1
    Alderleet

    Alderleet [OP] Ace of Spades

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    Nick
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    Alright, i decided to make this, since i just did it on both Bank 1 and Bank 2 (upstream/downstream) sensors.

    Also the "lieblweb" how-to link has no real visual reference, since the photos are blown out and tiny.

    Anyway, here we go!


    All work was performed on a 2000 Toyota Tacoma SR5 Automatic V6, NON-CA model.

    IMG_0026_4c48c1cda08ba2d3c2577ed1efef11a7359ff8b9.jpg
    IMG_0027_fa1b987d4202de8c2fe67e5a95307acae4ae5ace.jpg

    Materials needed:

    • Denso Oxygen Sensor (with gasket), Part #234-4162
    • 12MM Line Wrench
    • Anti-Seize lubricant
    • Wire Brush (if area is rusty)
    • Vehicle Lift
    • Good lighting
    • Beverage of your choosing



    • Note: The type of transmission, drivetrain, and Emission type will change the part number for your O2 sensor.


    • Also note: OEM sensors are DENSO. Many folks have put in Bosch or "universal" only to have them fail a few thousand miles down the road.


    • Also Also Note: Line wrenches are a life saver, because more than likely the nuts holding your sensor in place are fairly rusty and corroded, and a normal wrench has a higher propensity to strip them smooth.


    Down to brass tax:
    IMG_0021-1_78cb31b22565490673aa79e5178d51847eea6e73.jpg
    IMG_0042-1_d159c74c3e271aa98e42fa58abec10981bea0686.jpg
    IMG_0041-1_4360b42710ca667a2b6447e20a526dd2eb4994e5.jpg
    IMG_0022-1_92129adb1b9d4dad271a25148496149284f7c7ba.jpg








    I figured this would give a clearer picture, of "where exactly" the 2 Oxygen sensors are.

    Step 1: Unscrew the 2 nuts retaining the bad sensor.
    IMG_0029_b90844ffd9840e5f4c81af712456cb8439f15f85.jpg


    Step 2: Unclip harness. Use a screwdriver to pry the retaining tab off of the hook
    IMG_0031_918cb682dcf78ffdece23f7d2d5967d44d1eda52.jpg
    IMG_0034_0f52d273e81bdd0e9fd6206833c70cf307761c2f.jpg
    IMG_0035-1_0a8f47388b416b628428a15eb2c20ccd3e51f638.jpg
    IMG_0038_fa81f6e061092770a63b78efd4cd8e75ddcb8734.jpg

    Step 3: Remove new O2 Sensor from box

    IMG_0039_35a4cb44a6a0ba3dfea6d272d64c3567ace14bc8.jpg

    Step 4: Clean the area
    IMG_0044_de0214ca50b93b18f43212c9a0e911914a3bacfc.jpg
    IMG_0045_35c8e472c4719a18dd7190b55db7d63257c3f2f0.jpg

    Step 5: Put sensor in, and apply anti-seize lube to bolts
    IMG_0046_91ffa6617f74bf0a66876914c00da7486957ea59.jpg

    Step 6: Tighten nuts back on, and tighten the sensor *firm* but not to hard. Its not pressurized like a spark plug, so it doesnt need to be torqued down. Just tight with a quarter turn for peace of mind
    IMG_0049_f9bd756f2ff845889a8ace9422e3fcb191d5d695.jpg

    Step 7: Plug in connector
    IMG_0053_f953e60b037941078063a43b93ad74a0ba9ff03e.jpg

    Step 8: Wipe up the area, clean your hands, and enjoy a beverage

    IMG_0054_85db3005982e815f35a3b88483fe050c538b46d8.jpg
     
  2. Feb 3, 2012 at 6:35 AM
    #2
    BROGEO

    BROGEO New Member

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    Wow, this is a great website! Thanks for the info. I couldn't be better put.
    My son is a Master Auto Tech but sees me as a Pain in the A--. last time my O2 sensors went out on my Ford he got them both wholesale for $100. Problem was he guessed which ones were bad and he was wrong. I was out the money.
     
  3. Feb 12, 2012 at 6:58 PM
    #3
    james

    james In over my head...

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    Thanks for the step-by-step, Nick. I was *easily* able to the down downstream #2 sensor in about five minutes. Not so with the faulty one. The upstream #1 sensor has its electrical connection parked waaaaaaay up on top of the transmission, where the wiring is inconveniently stored. The "crux move" as we say in climbing parlance – the most difficult part of the problem – is in undoing the electrical connection parked where it cannot be seen nor easily gotten to. If I pay hundreds to a garage for the privilege, how will they eventually get at that pesky connector? How can I do it?
     
  4. Feb 12, 2012 at 7:09 PM
    #4
    tacoma04

    tacoma04 Laissez les bons temps rouler

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    I was able to get to the upstream sensor on a 5 spd manual 4x4 by removing the center console and taking the boots off of the shifters and going through the hole. I had to remove the sensor first and then pull the wiring up to the hole. Also had to remove the bolt holding the wire connector. A real PITA.
     
  5. Feb 12, 2012 at 7:12 PM
    #5
    Supra TT

    Supra TT Solid Axle FTMFW!!

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    SAS.. Need I say more.
    Nice write up. I had to replaced an O2 Sensor previously, heat and some swearing were involved...
     
  6. Feb 12, 2012 at 7:27 PM
    #6
    capetaco12

    capetaco12 .<>./

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    OME lift CBI sliders, front bumper homemade rear bumper 33x12.50 m/t Gears Aussie locker inchworm crawlbox Homemade flat belly
    iv replaced 3 of em between 2 taco's iv owned... Never been able to unthread them. Chop them off with a chistel becase they rot off in like 4 years:mad: I have clean/rust free truck envy right now.
     
  7. Feb 12, 2012 at 7:46 PM
    #7
    shampoop

    shampoop Well-Known Member

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    You don't need to use a line wrench on those bolts, the closed end of a standard wrench would work better. You only need to use a line wrench when you can't fit a closed end wrench or socket over a fastener because of the need for a slot for the wires or brake lines to pass through. You use a line wrench in place of an open end wrench because it makes more contact and has less chance of stripping than an open end wrench.

    You normally do need to use a line wrench on most oxygen sensors though. That's because most of them look like this
    [​IMG]

    The design used on tacomas is actually much better IMO, eliminates the need for a line wrench wrench or special socket which is actually a big deal in cars that have O2 sensors in hard to reach areas.

    anti seize is a great idea, and putting some dielectric/silicone grease in the electrical connectors is a great idea as well to protect from corrosion.

    Also, anytime you're removing ANY exhaust fastener, soak that shit with some penetrating oil and let it sit for a few minutes first. If your truck is pretty rusty, I'd soak it several times leading up to when you want to remove it. Decreases the chances of breaking/rounding fasteners and lots of swearing.

    Mine actually just went bad yesterday. This was the best deal I could find on the OE denso part. http://www.amazon.com/Denso-234-9003-Oxygen-Sensor-Ratio/dp/B000C5UFU8
    I would have paid more to get one at a local parts store immediately, but all of them only had the lowlier bosch sensors in stock.
     
  8. Feb 19, 2012 at 2:56 PM
    #8
    james

    james In over my head...

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    This was the best advice. Thanks. Everything worked out great.
     
  9. Feb 19, 2012 at 6:59 PM
    #9
    tacoma04

    tacoma04 Laissez les bons temps rouler

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    Glad it helped. I sure couldn't figure out any other way, but I am sure there is a one, lol.
     
  10. Feb 20, 2012 at 7:07 AM
    #10
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    Thank you for this! This is on my list of things to do. Anyone know where the best place to get the sensors besides Amazon?
     
  11. Feb 20, 2012 at 8:51 AM
    #11
    The Driver

    The Driver Trail Runner/Barefoot Beach Runner/Snow Skier

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    Awesome write up OP. Some green love to ya!
     
  12. Jul 12, 2013 at 5:26 PM
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    Westbound

    Westbound Member

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    Thank you very much for the suggestion. I followed your method and it worked... i didn't have to remove the bolt holding the wire, but finally the connector was disconnected after lots of cursing and struggle....
     
  13. Jul 13, 2013 at 7:03 AM
    #13
    tcrhino

    tcrhino Active Member

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    awesome! thanks for the step by step with photos! this should be a sticky :p
     
  14. Jan 11, 2014 at 10:22 AM
    #14
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

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    This is by far the dumbest fucking design flaw I've encountered on this truck.

    If they just moved the clip, where the sensor ties into the wiring harness, back 2" this would be a five minute job.

    Instead they decide to make the fucking clip impossible to reach from either under the truck or through the hole in the tranny hump.

    How you were able to remove 14mm bolt holding the harness, let alone get to the clip is beyond me. I can get a socket on the bolt but there is no way to move the driver because of the stick shift and body prevent any movement.

    I can barely fucking touch the goddamn clip with my fingers let alone even fathom out to unclip the sensor from it and insert the new one. It's as if you have to drop the fucking transmission to get to this fucking clip.

    What a pitiful design by Toyota. Meanwhile the downstream sensor wiring clip is right there next to the sensor. Easily accessible. Imagine that.
     
  15. Nov 7, 2014 at 10:47 AM
    #15
    JT1521

    JT1521 Well-Known Member

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    Is it ok to put anti-seize on the bottom of the o2 sensor gasket? I ask this because my friend who helped me install this did this before I could say anything lol. I hope the anti-seize doesn't leak into where the o2 sensor is.
     
  16. Nov 7, 2014 at 1:31 PM
    #16
    2004TacomaSR5

    2004TacomaSR5 Sentinel Prime

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    Looks easy to do, thanks for the writeup! Should become a sticky so we can find it easy when we need it moderators.
     
  17. Nov 7, 2014 at 1:38 PM
    #17
    paranoid56

    paranoid56 Well-Known Member

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    as long as its not a crap ton, you should be fine. if it freaks you out just pull it off and wipe it clean.
     
  18. Nov 7, 2014 at 4:10 PM
    #18
    JT1521

    JT1521 Well-Known Member

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    One other thing. Is the gasket reversible? Can it go on either way? Thanks.
     
  19. Nov 7, 2014 at 10:59 PM
    #19
    paquu

    paquu Well-Known Member

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    I asked the parts guy at the dealers counter. He said you can put it either way. I tried to put the new one on the same way the old one came off.
     
  20. Nov 8, 2014 at 7:51 AM
    #20
    EdFlecko

    EdFlecko Well-Known Member

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