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It is fairly common for this code to be set on this vehicle. There are two valves one controls vacuum from the engine to the charcoal canister and the other controls fresh air to the canister. Either of these failing will allow this code to set but it is more likely that the purge valve is clogged with carbon from the canister or has failed to seal.
Your purge valve is located on the back of the intake plenum, if you follow the vacuum line you will come to the valve mounted in a rubber sleeve. If the canister that is mounter under the left rear corner of the car has failed the carbon contained there will be drawn by vacuum to the front and get stuck in the valve. Inspect the valve for this carbon.
If the canister close valve located on the canister has failed to close the fuel tank pressure sensor will not "see" when the purge valve opens and you may have the same code set.
BotXXXXX XXXXXne is you can take a chance and put a purge valve on and hope the code does not return or you can diagnose the entire emission system to find the root cause of the problem.
Let me know what I can do to help you with this
The purge valve is at location #16 in the diagram below, these are not the best drawings, I will try to find photos and post those
The PCSV is what you are looking for
This is the canister at the back of the car
This is the purge valve
The actual purge valve looks like this
When you remove it tap the end that has the hose going to the back of the car on a piece of paper and see what comes out, if it is black chunks you will have to replace the canister and blow out the line between the purge valve and the canister.
The location picture is correct, the valve picture is a close representation. The valve is mounted below the intake directly below the throttle body on a metal bracket in a rubber sleeve. It will have a vacuum hose attached to either end and an electrical connector like the one pictured on the valve pic.
Hyundai really got its act together in '03 so the photos and diagrams for your year are a little weak. I will go through what is available for other components in the same area and see if one may show the valve better
Let me know if you find it in the meantime
Glad to help, if the light comes back, you didn't find particles of carbon and the gas cap fits correctly and is in place, let me know and I will help you get to the bottom of the cause. The next place to check will be at the canister for any leaking hoses or the valve back there may not be closing with the key on.
Glad you found it and thank you for using JA!!