Well how about lets start this thread all over again. So your check engine light is on. Do you have a code reader to find out why the light is on. I quickly skimmed over this entire thread and I didn't see a single trouble code posted. If I missed it let's see it and can probably figure it out before the dealer can. The only emissions related codes I've come up with on these cars have been broken wires at or near the evap solenoid under the rear lh corner of the car. One car had a corroded plug right at the solenoid that's attached to the side of the charcoal canister. Both were easy fixes. Otherwise I haven't seen any gas cap problems with these cars yet.
Either way we need more info. Letting the dealer try is obviously not working to well lol.
My mom says I'm cool
View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.4 mpg (US) ... 15.9 km/L ... 6.3 L/100 km ... 44.9 mpg (Imp)