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Pesky P0420 trouble code

Discussion in 'Technical Chat' started by travisdean54, Feb 24, 2013.

  1. Feb 24, 2013 at 12:28 PM
    #1
    travisdean54

    travisdean54 [OP] New Member

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    Travis
    Camden, NC
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    12 Trd Sport Long bed
    I still own my first Tacoma (2000 4wd 2.7L) with 261k. Every 2 years or so I get a check engine light and its always the P0420 code (catalyst below threshold bank). I've changed o2 sensors and it takes care of it for a while. I'm thinking its the converter going bad but the truck has the CA emissions package on it and there are 2 converters. Has anyone else had this problem and if so what did you do to fix it? Any help is greatly appreciated.
     
  2. Feb 24, 2013 at 6:37 PM
    #2
    bellassaiw10

    bellassaiw10 Formally afroman5015

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    Currituck NC
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    My MAF sensor was gunked up from the K&N, also welcome to the forums I'm from currituck
     
  3. Feb 24, 2013 at 10:06 PM
    #3
    01kingtaco

    01kingtaco Well-Known Member

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    Maui hawaii
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    Bigger tires, sound system, deck plate mod, fog light mod, straight pipe exhaust, blue led floor lights, ultragauge, 3 inch lift
    Had a exhaust leak fixed the leak no more code
     
  4. Feb 25, 2013 at 8:10 AM
    #4
    BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

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    Navarre, FL
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    Multi-point tow hooks, new bored 2.7L engine, custom paint. 3 inch adjustable Fabtech front coils, 2.5 inch rear AAL. Front Aussie locker. LED bed lights. Full LED conversion interior and exterior. Relentless Fabrication front and rear bumpers. 4X4innovation sliders. BAMF bed rack. CVT rooftop tent.
    You are definitely looking at a possibility of a bad catalytic converter. Getting 261K miles on one is not a bad lifetime for it. Do you have a scan tool that will give you live data? If so, look at the graph for your post cat sensor. If it is jumping up and down like the pre cat sensor, then you are looking at a catalytic converter that will need to be replaced, assuming that you have replaced both sensors and that there are no air leaks in your exhaust system.
     
  5. Feb 25, 2013 at 10:04 AM
    #5
    travisdean54

    travisdean54 [OP] New Member

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    Travis
    Camden, NC
    Vehicle:
    12 Trd Sport Long bed
    I've replaced both O2 sensors a couple of times. I've even replaced the #2 cat since I have two on this truck. I'm gonna crawl underneath and. Check for leaks again but maybe it's just time to replace the cats.
     
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