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  1. #1
    Member firemedic0135's Avatar
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    Jun 2007
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    East Texas
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    48
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    Arctic White
    2000/Trans Am

    OBD ll Code P0420 @ for 2000 TA

    Have a SES light on and showing P0420 which reads DTC P0420 "Catalyst System Low Efficiency Bank One"
    Is this the O2 sensor or the cat itself or something alltogether different.
    Was Going to gut the cats one day but if it is failing I will just gut them now,unless the previous owner did it for me.
    The car runs pretty well but sometimes chugs when I give it about half throttle.
    Any ideas?
    Thanks

  2. #2
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
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    2,723
    P0420 is usually the cat - GM just extended the warranty on them for the 00-02 cars to 10 yrs/120K.

  3. #3
    Member firemedic0135's Avatar
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    Jun 2007
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    Arctic White
    2000/Trans Am

    so the cat is covered by warrenty then?

  4. #4

  5. #5
    Member firemedic0135's Avatar
    Join Date
    Jun 2007
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    Arctic White
    2000/Trans Am

    That kicks ass but your link is broken or something.Tells me hotlink not avail.
    Shows this picture


  6. #6
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,723
    Hmmm....just clicked on it and works for me? Someone else will click on it and see if it works - not my link, just reposted it.

  7. #7
    Senior Member 02z28ls1's Avatar
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    Sep 2005
    Location
    near St. Louis
    Posts
    1,205

    navy blue
    2002 Z-28 Camaro M6

    Did the same thing for me-didn't work.........

  8. #8
    Member firemedic0135's Avatar
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    Jun 2007
    Location
    East Texas
    Age
    48
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    Arctic White
    2000/Trans Am

    Glad it not just me

  9. #9
    Member Frozen WS6's Avatar
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    Jan 2006
    Location
    EagleRiver, Alaska
    Age
    46
    Posts
    612

    RED, BLACK
    2001 WS6, 1998 TA

    My 01 WS6 did the same thing last month. I took it to the dealer and they put a new cat and o2 sensor on it under warrenty. But I had 64,??? miles and now just over 65,??? miles.

  10. #10
    Member firemedic0135's Avatar
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    Jun 2007
    Location
    East Texas
    Age
    48
    Posts
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    Arctic White
    2000/Trans Am

    well according to the poster above the warrenty covers up to 120k so I may be ok.Just hit 100k 2 days ago so I hope he is right.

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