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Old 09-11-2011, 12:42 PM
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bennyb53 bennyb53 is offline
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2019 Sentra
2002 Altima
 
Join Date: Jan 2011
Location: Hawaii
Posts: 2,105
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There are dozens of threads here on this issue. All code 0420 points to the Cat. What happens is the catalyst starts breaking up. In severe cases, it clogs your system. In others like excessive oil consumption.
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