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When to replace O2 sensors?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacoTuesday1, Mar 27, 2022.

  1. Mar 27, 2022 at 9:48 PM
    #1
    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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    I heard with enough miles the O2 sensors on these trucks can start to die, not so severely that they trigger a CEL, but enough that they fail to properly read/measure AFR in real-time resulting in the truck running too rich and burning too much fuel

    interesting coincidence that any time with my truck running it smells more like fuel than other cars for some reason.

    on other brands/vehicles I wouldn't be surprised at all to see O2 sensors fail, both upstream and downstream, and have dealt with it before

    has anyone replaced theirs as maintenance, or any other parts that could potentially cause worse MPG?
    Is there a preferred source on good quality O2 sensors?
    In my experience on other cars sometimes there is OEM match that looks identical, and aftermarket that can still work, same sensor, same connector, just really long wiring that the included instructions say to fold, tie up, and tuck away/hide (which looks ugly in the engine bay)

    [​IMG]
     
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  2. Mar 27, 2022 at 9:57 PM
    #2
    12TRDTacoma

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    Denso.

    The Toyota AFR sensors go bad somewhere between 120K - 200K+ miles. There will be mostly poor fuel economy coupled with a correlated degradation in proper fuel trim control. Which if left ignored for too long will burn out your catalytic converters.

    If you are somewhere in that mileage and have never replaced them, you probably should.
     
    wi_taco and Taco 422 like this.
  3. Mar 27, 2022 at 10:32 PM
    #3
    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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    exactly
    Will do, thank you!

    I dealt with a dead cat on another car before. Vacuum leak caused running rich = excessive temp killed the cat
    Definitely not something I want to go through with the Tacoma having not one but two banks of exhaust and each unit being expensive on its own
     
  4. Mar 27, 2022 at 10:36 PM
    #4
    12TRDTacoma

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    Don't even think about supercharging it then. Haha. I've already blown through both of my cats in as little as 130K miles.
     
  5. Mar 27, 2022 at 11:09 PM
    #5
    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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    on one side, "87 octane is cheaper" - not anymore...
    more hp/tq would sure be nice...
    engine swap might be a cool project
    everyone's seen the 5th gen T4R with 4.7L V8 supercharged, spins 40's
     
  6. Mar 27, 2022 at 11:17 PM
    #6
    12TRDTacoma

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    That thing must be wild.

    I agree though. More HP/TQ out of these trucks is necessary really. Fuel is expensive no matter what now. Might as well enjoy your drive time. Smiles per gallon.
     
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  7. Mar 27, 2022 at 11:18 PM
    #7
    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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    crazy to think they put ~220hp in a heavy high-drag truck with big tires when the average sedan at the time came with more than that
     
  8. Mar 27, 2022 at 11:20 PM
    #8
    12TRDTacoma

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    Try 181- 191 HP to the wheels.

    These trucks easily need 50 HP more to the wheels to be even close to effective.

    I love my 330 HP. Plus it sounds like a V8 now so wins all around. :D
     
  9. Mar 28, 2022 at 12:15 AM
    #9
    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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  10. Mar 28, 2022 at 12:27 AM
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    12TRDTacoma

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    I wouldn't touch the lower O2 sensors. They don't see the type of voltage switching duty that the upper air fuel ratio sensors tend to see.

    If you have a scanner however and see the sensor is literally not moving at all for a very long time (slow switching voltage is normal, fast indicates a bad cat, so it's normal when the cat is bad then it slows back down once the issue is remedied) then I would say replace it, outside of that, leave it.
     
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  11. Mar 28, 2022 at 12:29 AM
    #11
    12TRDTacoma

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    The part number for the uppers are correct based on the quick search results I did for them. You are correct. Both sides are the same and the wire length will be a touch longer than OE but it's not a huge deal as long as they hook up and thread in properly.
     
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  12. Mar 31, 2022 at 10:55 PM
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    TacoTuesday1

    TacoTuesday1 [OP] Well-Known Member

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    how about ignition coils?

    very common to replace those around 100k on regular cars
     
  13. Mar 31, 2022 at 11:04 PM
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    12TRDTacoma

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    Not unless they are misfiring. To replace them any sooner is a waste of money unless you are after performance, that of which the coils on these trucks are about as stellar as they get for the power levels they handle and beyond.

    Sidenote: if you have a question specifically for me, quote me or tag my name in your post that way I know you are asking something. I ran into the thread on accident as I was browsing the list of top posts of the forum.
     
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  14. Apr 1, 2022 at 6:14 AM
    #14
    amyracecar

    amyracecar Mule Barn Patron

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    I am a big fan of smiles/gallon!

    I get shit MPG in my MT b/c of the way I drive :)
     
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  15. Apr 1, 2022 at 6:42 AM
    #15
    TheDevilYouLove

    TheDevilYouLove You can’t polish a turd, but you can polish a TRD

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    How much of a bitch is it to remove the old sensors? Any particular socket for this task that Taco World likes?
     
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  16. Apr 1, 2022 at 9:53 AM
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    12TRDTacoma

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    Define shit MPG. It can't be worse than my 14 MPG on the highway and in the city.

    You need to get in touch with your inner Gumby if you want to be able to pull them off. They are in the most suck location I've ever seen. One more reason why I don't like Toyota. Haha.
     
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  17. Apr 1, 2022 at 10:03 AM
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    TheDevilYouLove

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    The upstream ones at least are easy to access. I am worried how tight they might be after 185k mikes though.
     
  18. Apr 1, 2022 at 10:05 AM
    #18
    tirediron

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    Huh... I thought it was curiosity that killed that cat...



    :rimshot:



    I'm here all week folks! :D
     
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  19. Apr 1, 2022 at 10:06 AM
    #19
    tak1313

    tak1313 Well-Known Member

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    A slugging wrench works wonders. Sometimes with a little judicious heat. You can usually get a used 22mm off fleabay for short money. They also come six sided, though it's kind of rare. I have both a 12 point and a 6 point, and they both work equally well without rounding corners. Just a whack or two is usually all that's needed. Once it starts moving, use some Kroil or whatever to seep into the threads so you don't gall it.

    upload_2022-4-1_13-1-54.jpg
     
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  20. Apr 1, 2022 at 10:18 AM
    #20
    12TRDTacoma

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    They could be a problem but you won't know until you get in there.
     

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