EVAP Problems 2007 Tacoma V6

I have a 2007 Tacoma V6. The CEL came on. After scanning the following codes were displayed. P043E, P43F, P2401, P2402, P2419 which pertains to the EVAP system. With all of these codes being displayed at once I am assuming that one part is causing this problem and maybe not! I am not sure what to check first or what is causing these problems. Can someone advise before I start spending a lot of money to fix.

Also, code B1794, Occupant Classification ECU Battery Positive Line Open appeared. How do I fix this code?
Thanks!

 

As as evap is concerned. Check the gas cap. Are one of those idiots that over fill their gas tanks. Sorry for be honest. Adding extra gas after the pump kicks offs goes the evap canister and can causes problems. The damage could already be done so you have no choice and drop the tank to replace it.