1997 Oldsmobile Aurora Catalytic convertor codes will not c

1997 OLDSMOBILE AURORA
135,000 MILES • V8 • FWD • AUTOMATIC
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DPN1460
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  • 2 POSTS
convertor replaced at 110,000 and o2 sensors, code cleared for 150 miles and returned. replaced convertor and used different sensors, code does not clear. car runs great but the light is annoying.
Oct 4, 2010 at 4:51 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
What code are you getting?
Oct 25, 2010 at 9:57 PM
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DPN1460
  • MEMBER
  • 2 POSTS
P420, any help will be appreciated.
Oct 28, 2010 at 2:52 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
A PO420 is a generic fault code indicating a drop in converter efficiency. I realize you replaced the converter and O2 sensors. Did you check to make sure the sensors are switching between a rich .08 and a lean .03 voltage shortly after starting the vehicle. If there is no change (flat line) you have a bad sensor. Most times a bad sensor will set a sensor code and not the converter. However, I have seen situation where the sensors are good enough to prevent the 02 code but bad enough to set a PO420. Also, is the converter new? Were the sensors you used new? Is the converter OBD2 complient?

Let me know
Oct 28, 2010 at 8:55 PM
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