Correct to the above statement! If you want to program an extra transponder key, it takes two keys to pull that off. I have not explored the keys with the remote.
Personally, I would have the cheap key made regardless. You get two of them for under $7 each. A hardware store or Walmart charges how much to cut a key? A few bucks maybe? For $20, you would have two extra working keys. I like having one with me for long trips. Just in case I lost my key far from home.
https://www.walmart.com/ip/AKS-KEYS-...nder/756108926
The 2020+ cars would use the same key.
If you lose a factory key with the remote, cross that bridge when the time comes. I have never used one of my factory keys (except when I programmed a third), and the key code tab is with that extra key, too.
I copied & pasted from an earlier post below -
No tools were necessary to code a third key for my 2017 Mirage.
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!