In this video I am diagnosing a P0455 EVAP system leak detected on a Chrysler 300.
Found that the evaporative emissions vent valve in the right rear inner Fender had failed. The vent valve is connected to the evaporative emissions canister. And the right rear inner Fender has to be removed to gain access to it.
On this Chrysler 300 it was relatively easy to test the EVAP vent valve. Once we reinstalled the new one I ran an EVAP leak test with the diagnostic scanner and the vehicle past verifying the repair was complete.