Red Triangle Warning Light/VSC/check engine

Hey, guys, long time lurker, first time poster.

I want to start out saying you guys and gals all seem to know so much about the Prius and you all seem to have a lot of knowledge from experiences with it. That being said, I was hoping someone could help me. My 2006 Toyota Prius has recently begun displaying a red triangle warning light, a VSC warning as well as a check engine light. My MPG has gone down considerably from 44 MPG to 35 MPG in the last 2 weeks and the cool air intake fan for the HV battery is constantly emitting a loud sound. I have already checked to make sure that the air intake is not clogged. (I took the whole thing out and cleaned it thoroughly.) I would greatly appreciate anyone's help or advice in this matter. If I'm screwed and need to buy a new hybrid battery so be it.

But either way please let me know.

I love my Prius.

Thank you so much for any help you are willing to give.

 

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