Important!: P0420 code

Discussion in 'Engine & Drivetrain Tech' started by 14 Silvy, Nov 22, 2016.

  1. 14 Silvy

    14 Silvy Active Member

    Messages:
    166
    Ok so my truck has 68000 miles I cleaned the intake 4 days ago with seafoam tonight I had a P0420 code pop up. I think it may be because of all the junk it blew out after hot soak. I wouldn't think the cat would be bad with that few miles so I cleared code so we'll see.
    Is this something to be really concerned about? The truck runs as it always has plenty of power and great fuel mileage. Thanks

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  2. Ginger

    Ginger Bubbles

    Messages:
    23,779
    check that you dont have a leak somewhere in the intake area. if its getting more air then what the MAF sensor says its getting it will think its wrong because the a/f ratio isnt right at the O2 sensor.
     
  3. 14 Silvy

    14 Silvy Active Member

    Messages:
    166
    Will do

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