P1457 Code Help
 

Hey Everyone,

So I was driving home from work a couple weeks ago and I saw my check engine light come on. I went home and checked it out and the code I got was "P1457 Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System)". I know for sure its not my gas cap I always tighten it to 3-4 clicks. Does anyone know what could be causing the light to come on? I drive a 03 civic si auto and I've been up to date with all maintenance work.

Thanks for the help in advanced