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A possible reason for an EVAP leak in the Hyundai Accent could be a loose gas cap, but there are other factors to consider. Before attempting to troubleshoot the emissions system, it's a good idea to first check if the gas cap just needs tightening. This simple step can prevent a lot of trouble and potentially save you money. If the problem persists, the fuel filler neck could be the next area to inspect for rust or damage that may be causing a leak. If no issues are found there, then the purge canister valve and charcoal canister should be examined. While it's advisable to have an automotive professional diagnose EVAP issues, you can also try to pinpoint the problem through a process of elimination on your own.
There are a variety of reasons why the trouble code p0455 indicating an evap leak may appear in your Hyundai Accent. Some common issues that could lead to this problem include damage to the evap system hose, a malfunctioning vapor canister purge valve, or a faulty charcoal canister.