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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

    #1
    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
     
    97Blk_one, Nov 7, 2009
    #1
  2. Nov 7, 2009 at 6:18 AM
    #2
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    Start with that O2/AFR sensor. If that doesn't fix it then you have two options: new CAT or O2 simulator.
     
    98tacoma27, Nov 7, 2009
    #2
  3. Nov 7, 2009 at 6:19 AM
    #3
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    And double check for any exhaust leaks
     
    98tacoma27, Nov 7, 2009
    #3
  4. Nov 7, 2009 at 6:35 AM
    #4
    97Blk_one

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    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
     
    97Blk_one, Nov 7, 2009
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  5. Nov 7, 2009 at 7:02 AM
    #5
    chris4x4

    #5
    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.
     
    chris4x4, Nov 7, 2009
    #5
  6. Nov 7, 2009 at 8:45 AM
    #6
    97Blk_one

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    97Blk_one [OP] Well-Known Member

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    Thanks Chris, I try to locate it.
     
    97Blk_one, Nov 7, 2009
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  7. Nov 7, 2009 at 8:45 AM
    #7
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    4 or six banger?
     
    98tacoma27, Nov 7, 2009
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  8. Nov 7, 2009 at 8:57 AM
    #8
    97Blk_one

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    97Blk_one [OP] Well-Known Member

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    Is this it?
    Osensor_c0b5f5cf0f6ab980973d3f16d2ee2390d99e723c.jpg

    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.
     
    97Blk_one, Nov 7, 2009
    #8
  9. Nov 7, 2009 at 9:02 AM
    #9
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    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
     
    98tacoma27, Nov 7, 2009
    #9
  10. Nov 7, 2009 at 9:08 AM
    #10
    97Blk_one

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    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
     
    97Blk_one, Nov 7, 2009
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  11. Nov 7, 2009 at 9:11 AM
    #11
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    :thumbsup:

    I can't guaranty that changing the sensor(s) will clear your issue though.
     
    98tacoma27, Nov 7, 2009
    #11
  12. Nov 7, 2009 at 9:14 AM
    #12
    97Blk_one

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    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
     
    97Blk_one, Nov 7, 2009
    #12
  13. Nov 7, 2009 at 9:16 AM
    #13
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    Download the if you don't have it already. There should be a section that deals with the code.
     
    98tacoma27, Nov 7, 2009
    #13
  14. Nov 7, 2009 at 9:20 AM
    #14
    HondaGM

    #14
    HondaGM CallSign Monke

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    catalyst efficiency below threshold,bad convertor........sorry.
     
    HondaGM, Nov 7, 2009
    #14
  15. Nov 7, 2009 at 9:20 AM
    #15
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    That's for the 2RZ/3RZ, The 5VZ is the same as far as the troubleshooting goes.
     
    98tacoma27, Nov 7, 2009
    #15
  16. Nov 7, 2009 at 9:29 AM
    #16
    97Blk_one

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    97Blk_one [OP] Well-Known Member

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    Appreciated all the helps '98 and jbob !
     
    97Blk_one, Nov 7, 2009
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  17. Nov 7, 2009 at 9:33 AM
    #17
    HondaGM

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    HondaGM CallSign Monke

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    welcome!
     
    HondaGM, Nov 7, 2009
    #17
  18. Nov 7, 2009 at 11:25 AM
    #18
    ETaco23

    #18
    ETaco23 Marshall offroad Fabrication

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    Color Match Grille, Bed mat, Kings with JBA UCA's, Dakars and 34" BFG KM3, Snugtop Canopy, and my "Marshall Fabrication" Rock Sliders.
    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,:)
     
    ETaco23, Nov 7, 2009
    #18
  19. Nov 8, 2009 at 4:57 PM
    #19
    97Blk_one

    #19
    97Blk_one [OP] Well-Known Member

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    Thank Taco23. I'll try that.
     
    97Blk_one, Nov 8, 2009
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