1997 Oldsmobile Aurora Catalytic convertor codes will not c

DPN1460

MEMBER
1997 OLDSMOBILE AURORA
V8
FWD
AUTOMATIC
135,000 MILES

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.

Monday, October 4th, 2010 AT 4:51 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,164 POSTS

What code are you getting?

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Monday, October 25th, 2010 AT 9:57 PM

DPN1460

MEMBER
2 POSTS

P420, any help will be appreciated.

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Thursday, October 28th, 2010 AT 2:52 PM

JACOBANDNICKOLAS

MECHANIC
108,164 POSTS

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

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Thursday, October 28th, 2010 AT 8:55 PM