Bank 2 sensor 2 Codes codes Gas milage!!!
 

Code (P0161) Ive changed the o2s reset the check engine light and for some weird reason its back on?Number 2 code p0440 Evap emission??Whats that lol?Thanks if somebody could help!!

I'm generic... new to Isuzu... However, Evap is a solenoid and has a vacuum source from manifold through the solinoid to the gas tank vent... i suspect no voltage or open coil on the solenoid.
I hope this helps you.
Bildarr ... in AZ