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2006 4Runner V8 p0420 & p0430 codes

Discussion in '4th Gen 4Runners (2003-2009)' started by johnj88, Nov 7, 2019.

  1. Nov 7, 2019 at 6:46 AM
    #1
    johnj88

    johnj88 [OP] New Member

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    2006 4Runner 4.7 v8
    I just bought my 4runner a couple weeks ago and just had to fix the timing because the mechanic who replaced the timing belt for the dealer I bought from didnt do it correctly. It has been running good for the last week and today two new codes came up the p0420 and p0430 codes. I have been trying to find what the most common cause is before I go and start spending money in places that arent needed. Any help would be appreciated.
     
  2. Nov 7, 2019 at 2:42 PM
    #2
    MattAK

    MattAK t4r.org refugee

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    Guess..
    Utah
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    Fixed broken shiz. Dobinson's 2.5"
    Could just be your downstream O2 sensors. If you change those and the code returns then it could be the cats. I didn't have p0430 just p0420 and changing my downstream O2 sensor on the driver's side got rid of it.
     
  3. Nov 7, 2019 at 2:46 PM
    #3
    Dillusion

    Dillusion New Member

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    Well a parts changer would change the O2's and pray.

    I'd personally take a meter to the 02s and see what you get first. See if you can get the voltage switching on it. OBDII Scanner should have it built in just get a half decent one.
     
  4. Nov 8, 2019 at 8:15 PM
    #4
    johnj88

    johnj88 [OP] New Member

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    It actually went off earlier today after driving it awhile so not sure what’s up with that
     

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