Should I go immediately to dealer with this code P2096?

Question

My 2014 Nissan Altima seems to be running great, however the engine light came on at the end of a 150 mile trip.  I went to Western Auto to have them read the code.  He said P2096. Is it time sensitive to get to the  dealership for repair?
What should I expect for a bill?  
My car has 53,000 miles...power train warranty still effective.  
Appreciate your help.

Answer 1

P2096 Post catalyst system too lean

Yes you should , get this resolved soon, What you would expect would be a A/F sensor for the upstream . You may want to ask to see if the powertrain warranty would still apply to vehicle