I believe all Mirage keys in North America would have some type of "electronic immobilizer". Your owner's manual should confirm that for your country. In North America we have three different key types (bolt print comes from my owner's manual) -
Type 1
2 keys with an electronic immobilizer & a key number plate.
Only the Canadian base level Mirages would have these keys, because all American Mirage trim levels come with remote entry.
Type 2
2 keys with an electronic immobilizer, keyless entry system, & a key number plate.
These keys would have a battery to operate the keyless entry system.
Type 3
Two F.A.S.T.-keys, two emergency keys, & a key number plate.
I have the type 2 keys above, & I can duplicate a third key for about $15. You must have two working keys to do so, however. This is how I made a third key (for anyone reading this thread) -
1. A blank key costs $10.70 with free shipping.
https://www.ebay.com/itm/New-Replace...75.c101224.m-1
2. My local ACE Hardware store charges $2.29 to cut a double-sided key.
No tools were necessary to code a third key for my 2017 Mirage. You follow the steps in your owner's manual (see below) -
1. Turn your ignition on with the first key (for about 5 seconds), & then turn off and remove.
2. After removing the 1st key, turn on the ignition with your 2nd key. In less than 10 seconds, the immobilizer indicator (multi-information display) will start to blink. Now turn off & remove your 2nd key.
3. You have 30 seconds to insert your new blank key. Turn on the ignition with the new blank key, & it will be automatically programmed to the car. It took less than 5 seconds to program itself, & the new third key starts the car without issue!
I follow the above steps with the new blank key that was cut by my local hardware store, & I now have an extra third key that will unlock my driver's door manually & will start my car. Should I lose a key in the future, I will still have two keys to make another replacement key again. Since my costs were under $15 (including shipping/tax), this is cheap key insurance.
Sadly, this doesn't help the recent posts (where no keys presently work). It would, however, prevent others finding themselves in the same situation some day. As it has been shared already, the alternative can be quite expensive.
Sidenote:
Owner's manual does state this procedure will not work for Mirages in Canada. Not sure about other countries?