is bad. NOt O2 sensor issue. You spent $400 ( labor+ part), it must be a rebuild one. Brand new part usually costs $800+ . Some local shops use very cheap parts, they turn bad very quickly. Best solution is buy a cat converter from auto zone (about $100 3 years warrenty) and let your local shop install it for you.
if only P0420 no other code, 95% sure CAT CONVERTER
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there is an old P0446, it showed before the 0420.
-majia01-
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09/09/2010 postreply
12:30:48
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P0446 is a little tricky
-nonego-
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09/09/2010 postreply
12:59:38
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i already put aside $400 to fix it
-majia01-
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09/09/2010 postreply
13:37:38