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P0420 2005 Nissan Sentra -

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what to know what to look at first front or rear O2 sensor

Vehicle: 2005 nissian sentra, 1.8L

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P0420 is most likely for a bad catalyst converter if there is no other issues and no other engine codes 

see more info on link below 

https://www.autocodes.com/p0420_2005_nissan_sentra.html

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