2007 Prius abs, vsc and sometimes triangle light!!

The type of phone app and OBD2 device you're using is likely the cause of a lack of information on dash lights. Also please tell us what region in the world you live in to give us a sense of the kind of water you're talking about?

Without more information it's hard to be certain. But if I had to guess I say it could be moisture in the spark plug hole where ignition coil plugs into spark plug. So I'd remove those and make sure everything is dry and switch the position of the ignition coils to see if P0301 changes to a different cylinder.

But that's just the start because P0301 is just the check engine light, not all the dash lights. And again back to your phone app, you need an app with hybrid car library of error codes, which might explain it. If you know someone with a different code reader, try that as well.

 

P0301 is an engine code, and you're not seeing any codes responsible for the ABS and VSC lights, so you've got an OBD reader that is able to talk to the engine but not to the brakes. A lot of people run into that.

When you have brake warning lights and you don't have a reader that can show you those codes, do this:

Blink (a/k/a Flash) Codes – How to. | PriusChat

 

probably connector corrosion, but you need a better reader

 

We have a whole thread here put together with extensive effort by mr_guy_mann about which OBD readers you can get for a Prius and which ones will and won't be able to show you all the codes you have:

Gen2 OBD2 app review | PriusChat