1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

P0420 Code

Discussion in '1st Gen. Tacomas (1995-2004)' started by flesheatingvirus, May 6, 2011.

  1. May 6, 2011 at 4:00 PM
    #1
    flesheatingvirus

    flesheatingvirus [OP] Well-Known Member

    Joined:
    Jun 25, 2008
    Member:
    #7570
    Messages:
    279
    Gender:
    Male
    ABQ, NM
    Vehicle:
    2016 TRD-OR 4x4AT Access Cab - Magnetic Gray
    Tech Package
    A little background. The catalytic converter was stolen off of this truck while on the dealer's lot. The dealer replaced it with a new one. It has about 2yrs use and is clear (I just had it put back on). I just replaced both O2 sensors.

    Now I get the P0420 code every day. I keep clearing it out with my ScanGauge, but it comes back. Could it be the dealer's POS cheap-assed cat? Any other ideas??
     
  2. May 6, 2011 at 9:42 PM
    #2
    bellassaiw10

    bellassaiw10 Formally afroman5015

    Joined:
    Jun 16, 2010
    Member:
    #39032
    Messages:
    5,282
    Gender:
    Male
    Currituck NC
    Vehicle:
    09 LMM 2500HD Duramax
    Do you have an aftermarket air kit ??
     
  3. May 7, 2011 at 12:07 AM
    #3
    pittim

    pittim mittip

    Joined:
    May 28, 2008
    Member:
    #6939
    Messages:
    16,555
    Gender:
    Male
    Vehicle:
    Respect your elder gen.
    Pink slider.
    420 comes up because of an exhaust leak or bad cat.
     
  4. May 7, 2011 at 8:23 AM
    #4
    jberry813

    jberry813 The Mad Scientist

    Joined:
    Jan 21, 2011
    Member:
    #49636
    Messages:
    16,597
    Gender:
    Male
    First Name:
    Jason
    Lake Tahoe
    Vehicle:
    2012 DCSB Sport
    ...too much shit to list.
    FMS has good info on p0420.
    FSM can be downloaded here:
    http://www.ncttora.com/fsm


    Copy/paste:

    The ECM observes the waveform of the heated oxygen sensor located behind the catalyst to determine whether the catalyst is performance has deteriorated. If the catalyst is functioning normally, the waveform of the heated oxygen sensor located behind the catalyst switches back and forth between rich and lean much more slowly. When the waveform of the heated oxygen sensor located behind the catalyst alternates flatteringly between rich and lean, it indicates that catalyst performance has deteriorated.

    After engine and catalyst are warmed up, and while vehicle is driven within set value and engine speed range, waveform of heated oxygen sensor (bank 1 sensor 2) alternates flatteringly between rich and lean (2 trip detection logic)
    • Gas leakage in exhaust system
    • A/F sensor (bank 1 sensor 1)
    • Heated oxygen sensor (bank 1 sensor 2)
    • Three–way catalytic converter
     
  5. May 8, 2011 at 9:51 AM
    #5
    flesheatingvirus

    flesheatingvirus [OP] Well-Known Member

    Joined:
    Jun 25, 2008
    Member:
    #7570
    Messages:
    279
    Gender:
    Male
    ABQ, NM
    Vehicle:
    2016 TRD-OR 4x4AT Access Cab - Magnetic Gray
    Tech Package
    I have a K&N. I just cleaned it and cleaned the MAF sensor.
     
  6. May 8, 2011 at 6:47 PM
    #6
    bellassaiw10

    bellassaiw10 Formally afroman5015

    Joined:
    Jun 16, 2010
    Member:
    #39032
    Messages:
    5,282
    Gender:
    Male
    Currituck NC
    Vehicle:
    09 LMM 2500HD Duramax
    Did the code go away because the maf was what was throwing mine
     
  7. May 8, 2011 at 9:20 PM
    #7
    capetaco12

    capetaco12 .<>./

    Joined:
    Mar 29, 2011
    Member:
    #53984
    Messages:
    3,695
    Gender:
    Male
    Cleveland Ledge, MA
    Vehicle:
    33's,armor,crawler,dents, ect
    OME lift CBI sliders, front bumper homemade rear bumper 33x12.50 m/t Gears Aussie locker inchworm crawlbox Homemade flat belly
    My answer wont help... But i still find the po420 humerous OBD has a sense of humor in the fact that its 420 when your truck is blowing smoke.:D
     
  8. May 8, 2011 at 9:27 PM
    #8
    jberry813

    jberry813 The Mad Scientist

    Joined:
    Jan 21, 2011
    Member:
    #49636
    Messages:
    16,597
    Gender:
    Male
    First Name:
    Jason
    Lake Tahoe
    Vehicle:
    2012 DCSB Sport
    ...too much shit to list.
To Top