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95 S_Trucker · 11-09-2015, 08:56 AM

From my experience, 95% of the time I see a P0420 or P0430, It is the converter, not the oxygen sensor.

At 240,000, I'd say it needs one.

I have seen P0420/P0430 show up after a converter replacement. That happens when someone puts in a puny little converter that was 1/3 the size of the oem converter.

11-09-2015, 08:56 AM	#10
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,179	Re: 2000 suburban ground issues From my experience, 95% of the time I see a P0420 or P0430, It is the converter, not the oxygen sensor. At 240,000, I'd say it needs one. I have seen P0420/P0430 show up after a converter replacement. That happens when someone puts in a puny little converter that was 1/3 the size of the oem converter.