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P0420 Coded

Discussion in '1st Gen. Tacomas (1995-2004)' started by 97Blk_one, Nov 7, 2009.

  1. Nov 7, 2009 at 6:06 AM
    #1
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Hello Everyone

    Sorry haven't been in here for months. Yesterday my truck "Check Engine Light" come on.I went to Autozone, and got it scanned. The code:

    P0420

    Bank-1(Heated Oxygen Sensor)
    Faulty Catalytic Converter

    I've search on here about the code P0420, couldn't find any ? Any help would be greatly appreciated. Oh,one more If I decided to do one of the above stated where would I start ? thanks
     
  2. Nov 7, 2009 at 6:18 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Start with that O2/AFR sensor. If that doesn't fix it then you have two options: new CAT or O2 simulator.
     
  3. Nov 7, 2009 at 6:19 AM
    #3
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    And double check for any exhaust leaks
     
  4. Nov 7, 2009 at 6:35 AM
    #4
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Thanks'98. How hard is it to take that sensor off, Where would I begin? Thanks
     
  5. Nov 7, 2009 at 7:02 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Its not hard. Its the sensor closest to the engine on the exhaust....Near the firewall. I belive 2 10 mm bolts, and then unplug it. Its tight in there to get to the plug, so take your time.
     
  6. Nov 7, 2009 at 8:45 AM
    #6
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Thanks Chris, I try to locate it.
     
  7. Nov 7, 2009 at 8:45 AM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    4 or six banger?
     
  8. Nov 7, 2009 at 8:57 AM
    #8
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Is this it?
    [​IMG]

    It's a 4, got 114,821 miles on it. This is the first time I got that "Check Engine Light" on. I was trying to see If I can fix it myself. I don't wanna take it to the stealer. Hopefully you guys and gals can help a brother out.
     
  9. Nov 7, 2009 at 9:02 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That would be Sensor 2. Sensor one will be before the CAT. The code doesn't specify exactly which sensor may be bad. It just says the the two sensors are reporting very similar readings back to the ECU. Sensor 1 should be reporting a waveform while Sensor 2 is generally flatter.


    http://www.obd-codes.com/p0420
     
  10. Nov 7, 2009 at 9:08 AM
    #10
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    oh..Thanks for the link'98. It's should help a dummy like myself out :D . Thanks again
     
  11. Nov 7, 2009 at 9:11 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    :thumbsup:

    I can't guaranty that changing the sensor(s) will clear your issue though.
     
  12. Nov 7, 2009 at 9:14 AM
    #12
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    That's good n'ouf for me,sir. I just can't drive with that "Check Engine Light " on, it's irritated the craps out of me :D
     
  13. Nov 7, 2009 at 9:16 AM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Download the FSM if you don't have it already. There should be a section that deals with the code.
     
  14. Nov 7, 2009 at 9:20 AM
    #14
    HondaGM

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    catalyst efficiency below threshold,bad convertor........sorry.
     
  15. Nov 7, 2009 at 9:20 AM
    #15
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
  16. Nov 7, 2009 at 9:29 AM
    #16
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Appreciated all the helps '98 and jbob !
     
  17. Nov 7, 2009 at 9:33 AM
    #17
    HondaGM

    HondaGM Roll Tide

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    welcome!
     
  18. Nov 7, 2009 at 11:25 AM
    #18
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    I had the same code last week. and it was infact the AFR sensor. Sensor 1
    I took it out and it was sooper black and filthy. changed it out from one from RockAuto.com and it is running better and no more CEL,:)
     
  19. Nov 8, 2009 at 4:57 PM
    #19
    97Blk_one

    97Blk_one [OP] Well-Known Member

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    Thank Taco23. I'll try that.
     
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