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Thread: need help

  1. 10-20-2010, 05:21 AM #1
    sandman1972
    sandman1972 is offline
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    black
    2001 pontiac trans am WS6

    need help

    i had a trouble code for the o2 sensors so i replaced all four. Then I got a knock sensor code for bank one. I replaced both sensors and the wire harness. Now I got a code for bank 1 catalyst effiency below threshold. Could it be something other than the cats triggering this code or could the new o2 sensors just be doing their job? the exhaust doesnt seem to be that old.
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  2. 10-20-2010, 11:47 AM #2
    blue02Z
    blue02Z is offline
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    Navy Blue Metallic
    2002 Z28

    Probably bad cats, my advice is ditch them and get you some lt's
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