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Old 08-22-2007, 07:01 AM
chatha
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Question 2003 altima 2.5S engine service soon light ON CODE P0420

I have 2003 Altima 2.5S with 129k miles on it The engine light came ON last day. Read code P0420 CAT efficiency below threshold.... I reset the code and the light gone. I drove the car 10 days and then light came back again with the same code I reset it again then after couple of trips it came back again...
Any suggestion what causing it coming back again and again If CAT is bad or BAD O2 sensor then it should come back right away when the car will start. Why it take 8-10 days to come back again with the same code??? Any help will be appreciated
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