Dodger86 the most common cause to the symptoms you describe is a flooded engine. In this condition there is basically too much unburned fuel in the combustion chamber and the motor won't run and won't start. This can be caused by starting the motor (say, to move it to a new parking spot in the driveway so someone else can get out) and turning it off after a very short period of operation. For cold temperatures, the engine ECU delivers a rich fuel mixture. If the engine is shut off while running very rich, it can lead to a flooded condition.
Another cause of a flooded engine is stepping on the gas pedal while trying to start the motor. This practice may have been necessary for motors with carburetors, but not with electronic fuel injection.
There are a couple of ways to clear this condition. One is to wait some time and hope the excess fuel either leaks past the piston rings or otherwise dissipates, or as Top_Fuel advised hold the gas pedal to the floor while starting the motor to trigger a clear flood mode through the ECU. The procedure for this is described in section 5 pages 18 and 37 in the 2015 Mitsubishi Mirage Owner's manual.
While we would like to do everything we can to help out, it is difficult to know exactly what caused your problems and exactly what was done to resolve it. No one wants to see you stranded. However, as was already stated, bringing up the problem with your dealer may not result in you getting a solid answer as to what caused this.
Hopefully it doesn't happen again, but if it does you have a bit more information to better understand what's going on.
Let us know how things go with your dealer, and again hopefully this doesn't happen to you again.
ETA: Also, as mentioned, diagnostic charges are not covered usually unless a fault is found.
Since there are very few cases of failing to start that I could uncover it's safe to say it was a random event and we should consider ourselves lucky that Mitsu has acknowledged it and has a solution.
I would not worry about this at all, these little cars are proving themselves to be some of the most reliable cars on the market. In time they may have proven themselves as some of the most reliable small cars ever made. (Yes, that's a broad statement but there's very few complaints on the web for a 4 year old model car and the few that exist are not common. https://www.carcomplaints.com/Mitsubishi/Mirage/2015/ )
Last edited by Wallythacker; 12-25-2017 at 12:57 AM.
Zero, my 2014 ES Plus gone but not forgotten. We're driving the Beetle of the 21st century
View my fuel log 2017 Mirage ES PLus 1.2 manual: 39.0 mpg (US) ... 16.6 km/L ... 6.0 L/100 km ... 46.8 mpg (Imp)
I've had probably 4 cars in the last month not start for me. Nobody else here(at work) has had a problem though. I blame it on letting go of the key before it's actually running. Once it's running it kills the starter itself. One car had a weak battery, it would crank but not fast enough to fire. Once flooded I let it sit for a week. Tried to boost it and it wouldn't start unless I Floored it.
Have you had any additional issues, or just what you've posted?