I was able to fix trouble codes P0441 / P0455 when the Evaporative Emissions System was stated to have a large leak. I was able to install the Vapor Canister Purge Valve in under 10 minutes on a 2010 Hyundai Elantra.
For those having a hard time or for those not finding a clear step-by-step solution for the Vapor Canister Purge Valve replacement, here is the video:


Let me know how it goes mates!