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presistant p0420 code 2002 tacoma

Discussion in '1st Gen. Tacomas (1995-2004)' started by seacraft23, Jun 20, 2009.

  1. Jun 20, 2009 at 12:46 PM
    #1
    seacraft23

    seacraft23 [OP] Member

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    changed both 02 sensors and cat still getting this code. between 50 and 70 miles of reseting. any ideas ? is this a common problem ? thanks for any help
     
  2. Jun 20, 2009 at 7:35 PM
    #2
    fireturk41

    fireturk41 I like to break shit!

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    mine tripped a week ago

    i found out certain brands of gasoline trip my sensors, especially shell gasoline, burn off your tank and refill with a different station/grade it may be an additive in the gasoline
     
  3. Jun 20, 2009 at 7:49 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Have you checked for exhaust leaks?
     
  4. Jun 20, 2009 at 7:50 PM
    #4
    ttylerr

    ttylerr Well-Known Member

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    try running a fuel system cleaner through your truck at your next fill-up
     
  5. Jun 20, 2009 at 8:14 PM
    #5
    Gadget@URD

    Gadget@URD Well-Known Member Vendor

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    That code is telling you that the ECU has diagnosed that the catalytic converter is worn out and needs to be replaced. It is not a problem with the O2 sensors.

    The cat is covered under the federally mandated emmissions warranty for 8 years or 80,000 miles. If you fit into that range, drive into your local dealer and have them install a new cat for you.

    Or;

    http://www.urdusa.com/index.php?cPath=66_170&osCsid=l4vuevhaeafq00s7mc7ecesoa7

    G
     
  6. Jun 20, 2009 at 8:58 PM
    #6
    seacraft23

    seacraft23 [OP] Member

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    the cat was changed already. i have checked for leaks. :( the sensors were changes because they werent reading properly with a scan tool. i thought that would have fixed it. went a head and replaced one of the cats which looked healthy. and the code still keeps coming up .
     
  7. Jun 20, 2009 at 8:59 PM
    #7
    seacraft23

    seacraft23 [OP] Member

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    PS that simulator is niceeeeeeeeeeeeeeeeeeeeeee lol
     
  8. Jun 20, 2009 at 9:09 PM
    #8
    XBrown

    XBrown Spartacus!

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    Yeah, a P0420 is a generic "catalytic efficiency" code. The computer gathers data from the upstream and downstream O2 sensors and compares them. The downstream should have a steady oxygen level, while the upstream O2 levels should wave up and down. When the downstream exhaust reads the same as the upstream, it indicates the cat isn't doing it's job. And, it takes 50-70 miles after resetting the computer for it to complete a full system check of the emission system.
     
  9. Jun 21, 2009 at 5:46 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Is the relacement CAT OEM?
     
  10. Jun 21, 2009 at 7:35 AM
    #10
    seacraft23

    seacraft23 [OP] Member

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    front cat yes rear cat not OEM
     
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