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  #16  
Old 04-22-2012, 10:22 AM
jaydaniels jaydaniels is offline
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2004 Maxima
 
Join Date: Sep 2009
Posts: 32
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DCARLTON- Here is my followup from my P0420 code. The check engine light went away after driving about 700 miles. I think the problem was some build up in the catalytic converter. My mechanic told me that the P0420 code is the catalytic converter and I mentioned that your probme went away after changing the O2 sensor and he said that the O2 sensor will make it go away for a short period of time and would most likely come back. In any case, my check engine light went off and it seems like Gas was not the issue and most likely just old carbon build up from sitting for 6 months. Thanks!
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  #17  
Old 04-23-2012, 05:46 AM
DCARLTON DCARLTON is offline
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1995 Maxima
2002 Altima
1997 Maxima GLE
 
Join Date: May 2008
Posts: 268
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I would agree with your mechanic about the 420 code being catalytic convertor related except for one thing.

The manufacturer of the pre-cat I purchased for the 2002 Altima warranted their pre-cat for 50,000 miles or 5 years. However, they stressed the importance of O2 sensors being maintained in order to maintain the efficiency of the pre-cat, and the importance of O2 sensors in determining the proper fuel mixture which if incorrect will destroy a catalytic convertor. They also indicated that if a P0420 code was thrown, do not under any circumstance assume that pre-cat was bad before checking both O2 sensors and replacing if it was time. Their experience had been that O2 sensors were key in the proper and efficient operation of a pre-cat.....this was all on the Altima model, not the Maxima.
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1995 Maxima SE (313,000+ miles 10/2012)
1997 Maxima (193,000 miles - bought from daughter when she traded for a Hyundai Elantra Coupe)
2002 Altima (daughter - totaled 12/2011 with 210,000 miles)
2012 Altima (daughter - replaced 2002 with 8 miles, now with almost 30,000 miles)
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