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O2 Senor or bad cat?

Discussion in '2nd Gen Tundras (2007-2013)' started by TxTundraGuy89, Sep 24, 2015.

  1. Sep 24, 2015 at 2:07 PM
    #1
    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    I have a check engine light on my truck my only question is how can I tell if it's my catalytic converter or just a bad o2 sensor cause my check engine light didn't come on till my back cat went bad so thinking it may be a bad o2 sensor?
     
  2. Sep 24, 2015 at 2:31 PM
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    jberry813

    jberry813 The Mad Scientist

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    Nobody's going to be able to answer that without more details (and maybe a punctuation mark every once in a while).
    What code(s) did you throw?
    How do you know the rear cat is bad?
     
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  3. Sep 24, 2015 at 2:50 PM
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    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    Sorry bad with punctuation.

    P0430 is the code it's saying, it's saying the catalyst is below threshold.

    I know the rear cat is bad cause the baffles have busted and was making a terrible rattling initially. Now some days it will other days it won't.
     
  4. Sep 24, 2015 at 3:06 PM
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    jberry813

    jberry813 The Mad Scientist

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    P0430 is downstream sensor. Downstream sensor only is for emissions, does not do anything else.
    Cat rattling is definitely a sign of a bad cat. You can test the upstream O2 sensors voltages to see if the sensors are doing what they are supposed to do. Cat's go bad...just depends on the life of the truck. Sucking in water into the intake, dumping fuel, running rich, etc are all things that could have happend upstream to cause the cat to go bad.

    What year and how many miles are on your truck?
     
  5. Sep 24, 2015 at 3:08 PM
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    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    So the downstream would be the 2nd sensor between the 2 cats?

    How do I test the upstream 02 sensor?

    I have an 07 Tundra 5.7 with 173,400.
     
  6. Sep 24, 2015 at 3:20 PM
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    jberry813

    jberry813 The Mad Scientist

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    Downstream is the sensor after the cats. Upstream is the sensors before the cats.

    See attached PDF. It goes in detail how to troubleshoot a p0430. Yes it's for a second gen taco, but the sensors work the same way. Still a 4 wire heated sensor. You can also youtube around. There's videos out there that show how to test.

    And 173k miles on a fuel thirsty v8....probably about right for the cats to be replaced.
     

    Attached Files:

  7. Sep 24, 2015 at 3:44 PM
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    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Jason's right on, 430 is a cat code. Means the downstream sensor is not showing that the cat cleaned up the exhaust content that the upstream sensor saw... put a cat in it.
     
  8. Sep 24, 2015 at 3:45 PM
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    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    So just replace the bottom cat then?
     
  9. Sep 24, 2015 at 3:49 PM
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    LOTSOFTOYS

    LOTSOFTOYS New Member

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    U have 2 sensors on each side right? There is a cat in between the sensors or 2 cats I'm between? What ever is in between the sensors is what the ecu is "monitoring". That is what failed the test causing the p0430.
     
  10. Sep 24, 2015 at 3:51 PM
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    TxTundraGuy89

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    Okay, so it's probably one closest to the block then more than likely. And then I would guess that being the front one went bad it caused the rear one to go out too?
     
  11. Sep 24, 2015 at 4:11 PM
    #11
    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Could have yes. The cat downstream from the second sensor is only there as a backup to cleanup the exhaust more for the ozone... it does get tested during an e test
     
  12. Sep 24, 2015 at 4:12 PM
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    jberry813

    jberry813 The Mad Scientist

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    Why you stealing my tundra thunder, Jace? It's cause I'm black isn't it? Fucking knew it. Racist.
     
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  13. Sep 24, 2015 at 4:14 PM
    #13
    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    Well this might get pricey unless I can sell 2 and get my 1 replaced haha but it possible to just get the top replaced and rewelded without having to take the manifold off?
     
  14. Sep 24, 2015 at 4:22 PM
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    LOTSOFTOYS

    LOTSOFTOYS New Member

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    Hahahaha I said u were right!!!!


    aren't they in a different pipe section? Not sure about what an exhaust shop could do. I will leave u with no aftermarket cat will perform like an oe
     
  15. Sep 24, 2015 at 4:24 PM
    #15
    TxTundraGuy89

    TxTundraGuy89 [OP] New Member

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    Well for mine is the passenger side which has the bad cats, there all on the same pipe just about a foot between them. Yeah if anything I'll put aftermarket on the 2nd ones mainly for sound.
     
  16. Sep 24, 2015 at 4:28 PM
    #16
    jberry813

    jberry813 The Mad Scientist

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    Well.....do you have to do smog check?
    If you really wanna do the cheap fix and don't have to do a smog...just get o2 simulators. 5 minutes to install and no more check engine light!
     
  17. Sep 24, 2015 at 4:30 PM
    #17
    TxTundraGuy89

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    Well I want to have at least the front fixed for the fact I can tell it's actually killing my mpg, not that I bought it for that but would like it fixed.

    That's another thing we have emissions but not sure if my cousin will check me for it, because if he doesn't going to cut off the rear 2 cats.
     
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