code p0420 for subaru legacy

Discussion in 'Subaru Legacy' started by swikman, Nov 25, 2004.

  1. swikman

    swikman Guest

    i have a code p0420 for my 1997 lagacy low cat effi, and the car hesatates
    some times when i start out,i saw a post saying to replace the manifold
    gasket and to check for leaks will that cause the hesitations or does it
    mean that the cats are clogged up?
     
    swikman, Nov 25, 2004
    #1
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  2. swikman

    mulder Guest

    The code indicates the cat is worn out. Your hesitation may be unrelated
    unless the cat is sufficiently clogged to create excess backpressure and
    reduce engine power. If you have less than 80K on the car the cat may be
    covered by the emissions warranty, consult a dealer. Either way the cat
    should be replaced.
     
    mulder, Nov 25, 2004
    #2
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  3. swikman

    Mickey Guest

    Seems to me that is the code I saw when in actuality, the problem was
    the gas cap. Tank is required to be sealed and if cap is loose or
    rubber seal damaged or dirty the seal is lost. I would check here
    first make sure all is well with seal and I bet the code will go away
    within a few days.

    Mickey
     
    Mickey, Nov 25, 2004
    #3
  4. swikman

    TG Guest

    "low cat effi" is usually caused by exhaust leaks on the engine side of the
    main converter. Although cats do wear out that is rarely the problem on
    these cars...lots of cats are replaced though due to ignorance. Do some
    other diagnostics on the expensive cat first...how is exhaust flow?TG
     
    TG, Nov 25, 2004
    #4
  5. swikman

    TG Guest

    Not necesarily ["low cat effi" is usually caused by exhaust leaks on the
    engine side of the main converter. Although cats do wear out that is rarely
    the problem on these cars...lots of cats are replaced though due to
    ignorance. Do some other diagnostics on the expensive cat first...how is
    exhaust flow?TG]

    Your hesitation may be unrelated
     
    TG, Nov 25, 2004
    #5
  6. swikman

    TG Guest

    No, the gas cap seal will trigger a different code/codes. TG
     
    TG, Nov 25, 2004
    #6
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