I jinxed it (updated May 24, 2021 1:30 PM)

We had a really good day yesterday--for the most part. We drove to Wichita to celebrate our niece's H.S. graduation and had a great time seeing family and friends!
While there, my brother-in-law's father-in-law (did you follow that? LOL) said that he heard that I like to tinker with cars. We were talking about cars and I told him how happy I was with our 2016 Santa Fe--103,000 and change and still running strong.
After the party, we headed home. At just about here, the MIL (i.e., malfunction indicator light, commonly called the check engine light) started blinking, and in case you are not aware, a blinking MIL usually indicates a pretty major malfunction. Additionally, the car's computer put the car in LHM ("limp home mode"), limiting the car's power so as not to have a completely catastrophic "hole-in-the-side-of-the-block" incident. I pulled off and at that point there wasn't a lot of noise (knocking or "chirping"). So we jumped to the West onto a two lane highway so that I would not make a lot of I-35 drivers mad at me (or, worse, cause an accident).
We drove through the megalopolis known as Orlando, OK, and then just a couple more miles after that, the "chirping" noise started.
So, we pulled off here, shut it down, and started making calls.
Fortunately, my wife's younger brother mentioned that a family we know through work owns a flatbed trailer. So we called. They were MORE THAN GRACIOUS and came to rescue us. I cannot thank them enough!
This morning, I connected my OBD scanner to the vehicle. It displayed code P1326. That's the knock sensor, and that is not cool. That code in conjunction with the sound you just heard most likely means that I spun a bearing. It's a pretty expensive repair if I have someone do it for me, mainly because it is seriously labor intensive. It's an engine-out repair, and usually requires stripping the engine down to the block, removing pistons & rods and crankshaft. Then it's recommended that you send the block to be "tanked" (cleaned) and machined and tested to ensure that there are no cracks. Also, the crankshaft would probably need to be re-honed and balanced before reassembling everything. Worst case requires buying a "new" (i.e., rebuilt) engine, which right now are running between $2100 and $4000. And even if I do that, I would be responsible for removing the old engine and installing the new. I am sure I could do any of this, except that I don't have all the tools I need (but I would be happy to buy them to my wife's chagrin), I do not have shop space (I suppose I could rent a space), and most importantly I don't have TIME (I have 3 ... no, 4 summer writing projects).
All that said, I kinda still want to do it myself.
Anyway, the moral of the story is this: never brag about how good your car is running, esp. if it is a high mile car!!

UPDATE (May 24, 2021 1:30 PM)
So, my both my brother-in-law and a local mechanic that I have used suggested that I call the dealer because they had heard stories of people whose cars had just barely passed warranty mileage still getting repaired (because they could show that the problem began prior to warranty). So, I called, but not with much hope.
The service agent looked up my vehicle and said, "Hey, you bought your car from Enterprise and you got an extended warranty as part of the deal." I had TOTALLY forgotten about that. I mean, I didn't even have the slightest remembrance of that part of the deal at all. Not sure how I forgot that since that's a pretty significant part of the package.
Anyway, long story short, if it is, indeed, something like a spun bearing, it would be covered by that extended warranty, and the techs at the Hyundai dealer would have the honor of either completely rebuilding my engine or installing a new (i.e., already rebuilt/refurbished) engine.
So, I never thought I would say this, but I hope it's a spun bearing.