P0420 2008 Nissan Sentra -

Question

I was wondering if o2 sensors go out a lot on a 2008 Nissan sentra

Answer 1

if there are no engine issues or exhaust leaks 95% of the time the catalytic converter

you might be covered under emisson warranty, depending on when your car was manufactured and how many miles you have

https://owners.nissanusa.com/content/techpub/warranty/2008_N_WIB.pdf