Gen 1 with lots of bad codes still running over a year later

I just wanted to share this situation here on the Gen 1 forum. It got posted originally in Gen 2 forum. Here is a post from Aug 2018 about several bad codes and the follow up on this car today, almost two years later!

"This is my first time posting. I think that my car might be at the very end of its life but I thought I would try to confirm things before I start planning the funeral. (I will try to keep this short.)

I have had this car since 2013. I bought it off of Craigslist during my junior year of college. The guy that I purchased it from told me that he had recently purchased and put in a new hybrid battery.
I don't have the paperwork at the moment, but I know that I have put a lot of miles on this car since purchasing it. The car is at 220,000+ miles now. But everything seemed to be running as normal a couple of months ago when the third alert light (the one that is just a car with an exclamation point over it) turned on. It kept turning on and then going back off again, for longer and longer stretches of time.

I didn't have time to take it in for a bit, but when I finally did I thought it would be something that could be fixed by a lot of general maintenance and upkeep. No such luck. I was given the news that my best bet is finding a new car. The guy at the repair shop told me that the inverter cooling system has been malfunctioning, likely for some time, and that it has damaged the hybrid battery.
A diagnostic test came back with these codes (it's a lot of codes):
V2101
P0103
P0003
P0203
P0303
P0400
U2102
P03E1
P0101
P1455
P3191
P3000
P3101
P3130
P3009

So, as you can see, it is bad news bears. But my question is, how is it that my car has been functioning with little to no change this whole time while somehow also completely self destructing? I'm still driving it at the moment and there is no change in gas mileage, no change in how it sounds, no change to how the battery looks on the screen (I don't actually know if this changes). Maybe it's been dying for so long that I've gotten used to how it runs?

Thank you for any help or advice that you can give me! (Sorry if I missed any important info.)

#1SmallLibrarian, Aug 1, 2018

The OP decided to get a Gen 3 and gave the Gen 1 to her sister, who kept driving it with no problems. I asked her today what happened with the car, and this is the response:
"You know, that crazy thing is still running fine. My brother still has it and he and my dad did a bunch of routine tune up work on it (just changing some spark plugs and such) a few months ago and it is still running fine. The AC still goes in and out my brother said, but also he just drove the thing from Indiana to Maryland a couple of weeks ago and he did get a flat tire on the way home but that was because he ran over something. It's the craziest thing, I don't understand how it is still alive."