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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  • 6 POSTS
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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OBXAUTOMEDIC
  • ✓ASE Certified Mechanic
  • 3,711 POSTS
  • ASE Certified Mechanic
Hello,

On some makes and model the code...

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

Indicates a bad O2 Sensor not the cat itself.


.
Nov 6, 2009 at 8:04 PM
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