Ok, I've looked at the other threads on codes, but no one seems to be able to answer the question that I have. I got tired of that check engine light and with multiple vehicles and autozone no longer running codes, I bought a scanner. I have two codes, the first being P0455 Mod$D1 EVAP Emission Control System Leak (Large) and the second being P0442% Mod$D1 EVAP Emission Control System Leak (Small). Now my question is, what in the hell does all that mean? Ok, I have a leak, but how do I narrow it down to an area a little more specific than "Your Jeep"? Also, a bunch of guys say to check the gas cap. Done that, not it. Cap doesn't leak and it's tight. Anyone have any experience with these codes or have had them in the past? What was wrong with your jeep? Where did you find the leak? I just need some help with these codes and I'm just not sure where to start, so any help would be great, thanks.