UFO and battery light but no p0a80

welcome!

start by searching for the autel scanner. seems to be the best bang for the buck with prius.
then post the codes again.

 

here's a thread:autel-maxi-ap200-go-buy-this.232861

 

Googling "ufo light", OP is the one-and-only plausible result. Could this be something else??

 

P1121 is usually the 3 way valve which determines when coolant goes into the thermos bottle. Usually the car will work OK with that not functioning. I suppose it is possible that it has broken in such a way that it leaks. This is located near the thermos and is a common part to fail. There are numerous youtube videos showing how to replace it.

P0505 is a dirty throttle body or MAF sensor. Try cleaning the throttle body and the MAF (they are in essentially the same place), then unhook the 12V battery for 30 seconds or so to force the car to relearn. Again, youtube is your friend. Do a little research on cleaning the MAF, both the bulb and a spot below it must be cleaned. Use MAF cleaner, don't touch it with anything but spray, and it is an easy job.

Check the level of the coolant for the inverter (reservoir next to the inverter), in the overflow tank (behind the radiator), and in the radiator (remove the tray to access it, support the "neck" when opening as it is not very sturdy). Don't run the car unless there is adequate coolant in all 3 locations. High in the radiator neck, full at the inverter reservoir, half full in the overflow tank. At the same time check the oil (because who knows when that was last done). The transmission fluid is probably filthy too, but that can wait.

If the OP can put the car up on jack stands finding an active coolant leak shouldn't be too hard.

In what way do the brakes "feel terrible"? Are they just worn down, won't hold pressure, make grinding noises, or ...?

 

It looks like he's using the car scanner app and no telling what car he has selected like whatever it was the last time or something the codes don't even line up with the car not even for a Corolla so. He'sgotvthe app setup for his VW and Jess plugged it into Prius or such. I've done this before.

 

The battery icon on the MFD relates the the 12 V battery, not the hybrid vehicle (HV) battery, as nobody has followed up on that point.

Get the 12 V battery fully charged and then load tested. Replace if necessary.

 

check the fluid level. air should feel spongy i think. you'd probably have to bleed them, and might need a tool for that.
low brake pedal could be pads, but there is a warning sound indicator when they are almost worn out.

 

how many miles on her?

 

Prius brakes are funny. In the fail-safe mode, you can feel a spongy pedal if there is air in there.

But in the normal mode you can't. The ECU just sends more fluid down the line to make up for the air and the pedal feels the same.

Which is why it can be a bad surprise if there's air that you don't know about and you're driving along, and then something triggers the brakes to go into fail-safe mode, only in that case "fail-safe" isn't.

 

i had a feeling that might be the case, but i couldn't remember the details

 

just broken in