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P0420 code on 4cyl

Discussion in 'Technical Chat' started by chrisx1, Sep 21, 2010.

  1. Sep 21, 2010 at 7:29 PM
    #1
    chrisx1

    chrisx1 [OP] Well-Known Member

    Joined:
    Sep 17, 2010
    Member:
    #43424
    Messages:
    49
    Gender:
    Male
    NE Missouri
    Vehicle:
    95 4cyl 4x4 5sp
    15x8 Pro Comp Wheels w/4" backspacing, 31x10.50 Mickey Thompson MTZ's, Bilstein 5100's set to 2.5", URD Short Throw Shifter kit, URD rear O2 sensor simulator
    I have a 95 4cyl 4x4 that threw a P0420 code today.

    code from the sticky section here says catalyst system below threshold......

    do I just need a new catalytic converter?

    what if I just ditch the converter?

    Forgive the ignorance - I'm just now learning the mechanics of the computer era engines.....last truck I had was a 81 ford.......

    Chris
     
  2. Sep 21, 2010 at 7:34 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,156
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Welcome to TW!
    First, check the exhaust manifold for leaks, or cracks. Then, I would check the rear O2 sensor.
     
  3. Sep 23, 2010 at 3:19 PM
    #3
    chrisx1

    chrisx1 [OP] Well-Known Member

    Joined:
    Sep 17, 2010
    Member:
    #43424
    Messages:
    49
    Gender:
    Male
    NE Missouri
    Vehicle:
    95 4cyl 4x4 5sp
    15x8 Pro Comp Wheels w/4" backspacing, 31x10.50 Mickey Thompson MTZ's, Bilstein 5100's set to 2.5", URD Short Throw Shifter kit, URD rear O2 sensor simulator
    So, I was doing the search that I should have before posting this question..........

    And - :eek: - shockingly, I'm not the first one to pop a P0420 code!!!!

    amazing!!!!

    Sorry to step on my d**k so soon after joining - breaking the cardinal rule of "search before you post"


    Now for my new question:

    It looks like the fastest/easiest/most certain way to fix this code is to get a O2 sensor simulator and put a straight pipe where the cat was. Is this correct, or make sense to anyone?

    I'm in Missouri - no emissions check yet, just a yearly safety inspection that isn't too tough.
     
  4. Sep 23, 2010 at 4:18 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,156
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Or, replace the O2 sensor thats malfunctioning :)
     
  5. Sep 27, 2010 at 4:19 PM
    #5
    chrisx1

    chrisx1 [OP] Well-Known Member

    Joined:
    Sep 17, 2010
    Member:
    #43424
    Messages:
    49
    Gender:
    Male
    NE Missouri
    Vehicle:
    95 4cyl 4x4 5sp
    15x8 Pro Comp Wheels w/4" backspacing, 31x10.50 Mickey Thompson MTZ's, Bilstein 5100's set to 2.5", URD Short Throw Shifter kit, URD rear O2 sensor simulator
    so there could be some more problems with my exhaust..........

    Here's the back o2 sensor:

    [​IMG]

    Here's the front o2 sensor:

    [​IMG]

    Here's the muffler:

    [​IMG]

    Since the nuts on the o2 sensors have rusted away, I'm guessing there's probably some other leaks in my system in front of the o2 sensors.
    So I'm going to get some replacement nuts before I pull that back one to look at it so that I can put it back together.

    Is there a gasket in there also? If so, I had better get one of those too.

    I think we are getting closer to a new exhaust with every step...:eek:
     
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