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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?

This topic contains 4 replies, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 11 months, 3 weeks ago.

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  • #986868
    Patrick Mayville
    Patrick 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?

Viewing 4 replies - 1 through 4 (of 4 total)
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  • #986869
    Patrick Mayville
    Patrick 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 Mayville
    Patrick 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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