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can bad plugs cause faulty cat readings?

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here can bad plugs cause faulty cat readings?

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  • #986868
    Patrick MayvillePatrick Mayville
    Participant

      Installed new spark plugs a few weeks ago and now getting P0420 codes… is it just a coincidence or could the new plugs not be working correctly?

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    • #986869
      Patrick MayvillePatrick Mayville
      Participant

        Sorry, failed to state it’s on a 2014 Ford Focus with 137k miles.

        #986873
        Nightflyr *Richard Kirshy
        Participant

          Are they the MFG recommended plugs?
          Are they gaped correctly?

          #986897
          Patrick MayvillePatrick Mayville
          Participant

            Yes correctly gaped. I chose better then oem plugs from rockauto.

            #986903
            Nightflyr *Richard Kirshy
            Participant

              If the plugs are correct and properly gaped.
              Then your left with the following possible causes:\
              Faulty oxygen sensor
              Faulty air-fuel sensor
              Worn or internally failing catalytic converter (Most Common)
              A leak in the exhaust system
              Misfire (the root cause of converter failure)
              Rich or Lean air-fuel ratio (the root cause of converter failure)

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