2016 Prius Check Engine Light – P0456 Code

Yep; start with the gas cap and inspect the lip of the fill tube. Any nicks or cut to the gas cap gasket or tube lip can cause a leak.

Good Luck...

 

Lamp should extinguish itself after it passes a couple of self-test; otherwise it will remain on. Check your registration to see when it requires a smog test - that's the time frame you have to get it sorted. The car will drive fine with that lamp lit, unless you get other problems. Since that lamp is already lit; if another problem crops up you won't know about it - since the trouble lamp is already lit.

Good Luck..