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96 taco 2.7 p0420 cat code

Discussion in 'Technical Chat' started by 1BadComa, Feb 8, 2010.

  1. Feb 8, 2010 at 12:19 PM
    #1
    1BadComa

    1BadComa [OP] Member

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    3" body lift 33" bf goods fender flares
    head gasket was just replaced...the truck sat a year and a half... does anyone think this code could be caused by coolant in the combustion chamber maybe gummed up a o2 sensor? or just sitting and not being driven??
     
  2. Feb 8, 2010 at 12:21 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It's possible. It can be caused by a number of things actually.

    Bad AFR (front O2 sensor), exhaust leak(s), bad rear O2, vacuum leak, cracked exhaust header/manifold
     
  3. Feb 8, 2010 at 12:24 PM
    #3
    1BadComa

    1BadComa [OP] Member

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    cool, thanks I dont think the rear 02 was ever replaced...I replaced the front about 2 years ago...really hope it isnt a cat problem
     
  4. Feb 8, 2010 at 12:47 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Do you have to worry about emissions? Smog test? I have seen a few guys recently get aftermarket CATs through rockauto.com that seem to work.

    URDUSA.com also makes an O2 simulator that tricks the ECM into thinking the CAT is good (no CEL light either)
     
  5. Feb 11, 2010 at 7:51 AM
    #5
    1BadComa

    1BadComa [OP] Member

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    3" body lift 33" bf goods fender flares
    yeah unfortunantly i have the emissions and smog tests and my tags die in two months.. but thanks for the helpful info...ill def be checking into it..
     
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