1997 Oldsmobile Bravada 0420 OBD code

1997 OLDSMOBILE BRAVADA
161,200 MILES • 6 CYL • AWD • AUTOMATIC
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AD142314
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0420 trouble code keeps popping up i just replaced my catylact converter a few months ago. why does that code keep popping back up
Nov 6, 2009 at 8:01 PM
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