Hyundai Repair: P0455 code, 2003 hyundai sonata, hyundai sonata

Question
I have a 2003 hyundai sonata and I have the check engine light on. I took it to advance auto and they tell me the code is p0455. i know my oil change is way past due but i need to know what i should do about this. the guy told me that the code means i have a large leak somewhere dealing with the emission systems. i just moved to the area i am in and i don't want anyone to try to get over on me, so can you help me know whats going on and what I should do!

Answer
Hello Tameka,
This code's description is P0455 Evap Emission System- Large Leak. Usually ,arge leak means you drove or still driving your vehicle with loose or missing gas cap. Check your gas cap if it is tight. Even if that is the case , tightening it might not turn the check engine light off. So you have to erase the code with a scanner. If your gas cap is in place and tight then you probably have a leak in the emission system which includes numerous parts. So it should be inspected by a proffesional.