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PO430 code

Discussion in '1st Gen Tundras (2000-2006)' started by zeerex99, Feb 25, 2020.

  1. Feb 25, 2020 at 5:21 AM
    #1
    zeerex99

    zeerex99 [OP] New Member

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    None
    2003 SR5 4.7. 240K miles and owned it since new. Very well taken care of. Started throwing the PO430 code months ago. Replaced the Bank 2, Sensor 2 O2 sensor. Got another code for the same sensor about 30 mile later. This past Sunday I replaced the cats and resonator section of the exhaust (O2 boss was rotted out), removed and cleaned the throttle body, installed new valve cover gaskets while I was at it, installed a new sensor then then cleared the code. About 30 miles later the code is back.
    Any ideas? Could this be a fuel injector problem? New injectors wouldn't hurt but I don't want to chase this with $$$ and my emissions test is coming up.
    Thanks.
     
  2. Feb 25, 2020 at 5:51 AM
    #2
    BubbaW

    BubbaW Saw it right off

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    For those following, nothing appears to have changed since 5 days ago in original thread.

    Bank 2 sensor 2 issues
     
  3. Feb 25, 2020 at 5:59 AM
    #3
    Jrharvey02

    Jrharvey02 New Member

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    You could try an 02 sensor spacer, it makes it so the sensor isn’t in the middle of the stream, more towards the edge and can fix the dash light problem (but not the actual problem). Worked in a Jeep I had.
     
  4. Feb 25, 2020 at 6:25 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Most of these code threads baffle me. Not knocking the OP here, but usually what I see is:

    1) Code thrown

    2) Parts installed

    3) Code goes away (or does not)

    4) Code comes back (after ECU reset?)

    So, I am assuming either:

    1) A thrown code has multiple issues surrounding

    2) Thrown code is a general and not specific direction.

    These exhaust codes threads seem the trickiest. I meditated on Blown Head Gaskets Research one time, but couldn’t handle the thought of one going bad on my truck so I had to stop.
     
  5. Feb 25, 2020 at 6:41 AM
    #5
    JohnLakeman

    JohnLakeman Burning Internet Daylight

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    TRD Pro grille, 2018 LED Headlights, Undercover Flex bed cover, Neoprene seat covers, Bed/tailgate mats, Power tailgate lock, auto headlights, illuminated key switch
    From https://www.obd-codes.com/p0430
    :

    A code P0430 may mean that one or more of the following has happened:
    The catalytic converter is no longer functioning properly
    An oxygen sensor is not reading (functioning) properly
    There is an exhaust leak


    This may be totally off-the-wall, but what is the service history on the secondary air injection system? As @Professional Hand Model said, these codes are all over the place, and sometimes seem unrelated. If yours has never had any air injection system issues, it's a miracle.
     
  6. Feb 25, 2020 at 6:45 AM
    #6
    Mustanley

    Mustanley New Member

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    Toytec Eibach Coilovers|Doug Thorley Headers|Spintech 3000XL Muffler
    What replacement cats did you put in? I've seen reports of aftermarket converters not being efficient enough to bring the O2 readings back within spec even though the original cat(s) were indeed bad and needed replacing. I used a magnaflow catted mid pipe to replace my passenger side factory cat when getting the p0420 code it indeed fixed the problem.
     
  7. Feb 25, 2020 at 6:51 AM
    #7
    Jrharvey02

    Jrharvey02 New Member

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    My jeeps p0420 code was a result of installing a k&n cold air intake. I’ve also read of another user on here that switched air filters and got p4xxx code.
     
  8. Feb 25, 2020 at 7:34 AM
    #8
    FirstGenVol

    FirstGenVol The "Mangler"

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    Too many
    Isn't that only on VVTI engines? His 02 won't have that.
     
    Sangre Kid likes this.
  9. Feb 25, 2020 at 8:16 AM
    #9
    JohnLakeman

    JohnLakeman Burning Internet Daylight

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    Yeah, he has a 2003, but you're right. Further research shows that SAIS started on Tundras in 2005. My initial stab at confirmation showed 4.7L Sequoia with SAIS as early as 2000?, but apparently not for Tundra. It was an idea...or a brain fart. :oops:
     
  10. Feb 25, 2020 at 8:19 AM
    #10
    TX-TRD1stGEN

    TX-TRD1stGEN I'm not taking a knee

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    What brand O2 sensor are you installing? I've heard these trucks dont play nice with certain brands (Bosch)
     
  11. Feb 25, 2020 at 9:54 AM
    #11
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    This answer is a critical one.
     
    BubbaW likes this.
  12. Feb 25, 2020 at 10:22 AM
    #12
    BubbaW

    BubbaW Saw it right off

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    Just curious....what is an "bad O2 boss". The OP has mentioned fixing/working on that item in their other thread and this thread also. Google doodle don't help me diddly ?

    and possibly which particular ones and any other codes ?
     
  13. Feb 25, 2020 at 10:28 AM
    #13
    JohnLakeman

    JohnLakeman Burning Internet Daylight

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    TRD Pro grille, 2018 LED Headlights, Undercover Flex bed cover, Neoprene seat covers, Bed/tailgate mats, Power tailgate lock, auto headlights, illuminated key switch
    From the context, I interpret "boss" to be the half coupling or collar welded into the exhaust piping for mounting the O2 sensor.
     

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