just a tip on diagnosing the situation.

Check the basics first, and describe any driveability issues

the first thing I would do after seeing the
po455 code ( mind you I have no experience with the code or your engine) is check the gas filler cap for tighness and visually check cap mating surfaces.

WIth a flashlight you can check fuel hoses under car near axle and in ( next to shock ) rear passenger side wheel-well.

Then I would check the air intake connections from air filter on back, make sure all the connections are attached and no crack or holes.

Then i would check fuses and relays involving fuel and related.