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-   -   Answered: Code readings p0420 AND p0171 2005 Nissan Altima 2.5s? (https://x.nissanhelp.com/forums/autocodes-com/32066-answered-code-readings-p0420-p0171-2005-nissan-altima-2-5s.html)

AutoCodes.com 07-30-2020 05:00 PM

Answered: Code readings p0420 AND p0171 2005 Nissan Altima 2.5s?
 
The most common cause of the problem is the Mass Air Flow (MAF) sensor. You could try clearing the MAF and changing the air filter first. If the problem persist, the next step is to replace the Oxygen Sensor.

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