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6th Generation Maxima (2004-2008) Discussion of the 6th generation Maxima. Come see what others are saying.

P0420 code??

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Old Apr 15, 2026 | 09:36 AM
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Max07beater
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P0420 code??
Hey! 183,000 miles strong. Catalytic converter functional malfunction code went a couple days ago.

No signs or symptoms to note.

AutoZone doctor said to try Cataclean.

Thoughts?
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Scraping grinding noise at speeds below 20




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