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Discussion in '1st Gen Tundras (2000-2006)' started by tdchester, Jul 27, 2016.

  1. Jul 27, 2016 at 3:30 PM
    #1
    tdchester

    tdchester [OP] New Member

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    Just purchased my first Tundra a few months ago. 2005 SR5 Crew Cab. Having issues with Cat. Conv. From what I've seen, are there 4 Cats on the exhaust system? 1 prior to O2 sensor and 1 after on each side? Just want to be clear. The two before the O2 sensors don't look like a typical Cat. Any help would be appreciated.
     
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  2. Jul 27, 2016 at 4:10 PM
    #2
    fuguchan

    fuguchan New Member

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  3. Jul 27, 2016 at 7:06 PM
    #3
    Sean266

    Sean266 #ThinBlueLine Staff Member

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  4. Jul 27, 2016 at 7:27 PM
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    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Well you have 4 oxygen sensors. Cats should be between the two sensors on each side. There may be a resonator behind once it collects into one pipe
     
  5. Jul 27, 2016 at 7:43 PM
    #5
    Law323

    Law323 Pray for peace, prepare for war

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    Not much knowledge in my itty bitty brain when it comes to 1st gen

    Welcome all the same!!
     
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  6. Jul 27, 2016 at 10:02 PM
    #6
    csuviper

    csuviper Moderator Staff Member

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  7. Jul 28, 2016 at 5:01 AM
    #7
    tdchester

    tdchester [OP] New Member

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    My question is, can I do away with the cats, post O2 sensors? im not too sure on the cats (integrated cat) pre-o2 sensors. Seems like a little overkill to me.
     
  8. Jul 28, 2016 at 6:24 AM
    #8
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Those are called "Cleanup cats" they are only there to help it passes emissions. So yes u can get rid of them and not have a light come on
     
  9. Jul 28, 2016 at 7:19 AM
    #9
    tdchester

    tdchester [OP] New Member

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    You are referring to the cats post-o2 sensors, not the cats in between the o2 sensors, correct?
     
    Last edited: Jul 28, 2016
  10. Jul 28, 2016 at 1:50 PM
    #10
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    correct. each side of the engine has a bank of 4 cylinders. the pre cat sensor for each bank tells the engine how its running lean or rich. then you have a catalytic converter on each side that cleans up the exhaust. then you have a sensor on each side post cat. these sensors tell the engine if the cats did their job or not cleaning the exhaust stream. anything after those last sensors are called cleanup cats. some vehicle come with resonators to change the sound or provide more back pressure to the engine. then lastly you have your muffler.
     
  11. Jul 28, 2016 at 2:10 PM
    #11
    tdchester

    tdchester [OP] New Member

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    Ok, just wanted to be on the same page as you. I put a scanner on it, got the P0402 error (bank 1, passenger side I think). Cat Conv I would presume. What are your thoughts on changing the o2 sensors on the side that is giving the error before changing out the Cat?
     
  12. Jul 28, 2016 at 2:32 PM
    #12
    Yotalover88

    Yotalover88 "If it ain't broke don't fix it"

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  13. Jul 28, 2016 at 3:58 PM
    #13
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    R u sure on that code number? Normally cat codes are p0430 and p0420
     
  14. Jul 28, 2016 at 4:08 PM
    #14
    tdchester

    tdchester [OP] New Member

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    Fat fingers, P0420 is the code.
     
  15. Jul 28, 2016 at 4:10 PM
    #15
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Yes bank 1 cat is toast. No oxygen sensors wont help the situation unless you also have codes for sensors.
     
  16. Jul 29, 2016 at 4:11 AM
    #16
    tdchester

    tdchester [OP] New Member

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    Ok, that's what I was leaning towards as well. Just needed an opinion from someone with experience on the Toyota. I appreciate your help.
     
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