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P0420 Trouble Code

Discussion in 'Stock 2006 -2010 Explorers' started by dflondro, January 12, 2014.

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  1. dflondro

    dflondro New Member

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    City, State:
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    I have a 2006 4.6L Explorer. My check engine light came on. I purchased a OBD reader and found that the code was a P0420. I reset the code. I read in the owners manual to see how to get the vehicle emissions ready for emissions testing. I ran the engine through the profile but the OBD still says the vehicle is not ready for emissions test. I ran the vehicle for 3 more weeks and the check engine light came on again with the same trouble code. Has anyone had this issue? I am hoping to avoid having to buy a new catalytic converter unless it is really needed.
     
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  3. swshawaii

    swshawaii Elite Explorer

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    Hope you understand that clearing the p0420 code, or any DTC for that matter, does NOT fix the issue. Even if it's erased with your new "reader", trouble codes will remain stored in memory until corrected. The "Readiness For Inspection" process applies to vehicles after they have been repaired. Call around and find an independent exhaust/emissions specialist. GL

    P0420 Catalyst System Efficiency Below Threshold (Bank 1)
    (Owners Manual Pages 310-311)
    http://www.fordservicecontent.com/Ford_Content/catalog/owner_guides/06expog2e.pdf
     
  4. dflondro

    dflondro New Member

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    Thanks!! I understand clearing the code will not resolve the issue. I would think that after running the vehicle through the readiness profile, either the check engine light would come back on for the same error code. I will have to take it in to have the sensors and catalytic checked.

    Thanks!
     
  5. Flag Gibby

    Flag Gibby Well-Known Member

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    In the back of my brain, I seem to recall that running E85 all the time can do funky things to the emissions system. Don't know if your vehicle is E85 capable or if you have been running E85, but just wanted to put that out there.
     
  6. makuloco2000

    makuloco2000 Active Member

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    Your cats are done for, replacement is the only repair, see it all the time on the 4.6l. You under 80k miles?
     
  7. gbasplen

    gbasplen New Member

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    Reprogramming the PCM worked for me. A $89 fix by the dealer has kept the Check Engine light off for about 1 week and ~700 miles. Every test I did pointed to the Cat Converter. So far reprogramming the PCM fixed my problem for long enough for me to get through the state emissions check.
     
  8. Boomyal

    Boomyal Active Member

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    ...for that matter, just use your tool to turn off the light before you take it in for the State inspection, then deal with the problem at your leisure.
     
  9. gbasplen

    gbasplen New Member

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    I have tried that. The state of Maryland uses a tool that plugs into the OBD II port. The state's OBD II reader knows if the CEL has recently been reset. They asked me if I'd disconnected the battery recently. They wanted me to wait about 1 week and come back so the car had time to "re-diagnose" itself to see if the CEL would come back one.
     
  10. dflondro

    dflondro New Member

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    I had to replace the catalytic. The repair facility said it is a common problem. Thanks for the help!
     

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