Troublecode 0420: PCM as determined that he catalyst system efficiency....

Discussion in 'General Motoring' started by Strorg, Oct 31, 2003.

  1. Strorg

    Strorg Guest

    Took daughter's 99 Accord LX (4 cyl) to Autozone for CEL check. Their
    rudimentary device gave this code and message:

    Code 0420: The PCM has determined that the catalyst system efficiency for
    bank 1 is below threshold for the current engine operating conditions.

    I suspect front O2 sensor based on some research I've done on the web. Any
    ideas, other than paying the dealer $75 for the full diagnosis?

    Thanks...TH
     
    Strorg, Oct 31, 2003
    #1
  2. Strorg

    psychicmechanic Guest

    Be advised the warranty for cat converters is a federal mandate in USA of 8
    years or 80,000 miles. This also happens to be about the mileage that they
    tend to die...

    The rear 02 sensor (only one bank on a 4cyl) is actualy the one that
    measures cat efficiency. Most common cause of this code is a dead cat.

    Peace.
     
    psychicmechanic, Nov 1, 2003
    #2
  3. Strorg

    Strorg Guest

    Figures....just broke 80K miles.
     
    Strorg, Nov 1, 2003
    #3
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