Loud engine sound during first start

Hello everyone,

I found an 07 Prius which costs next to nothing, but it's located quite a distance from me.
The owner described the issue as the car runs a little loud, but then quiets down.

I have the video of it running, but I'm not allowed to post it, as my post count has to be at least 4. Will post it once it is.
Check engine on, code unknown.

To the people familiar with this engine, what could be the reason based on the way it runs?
Would it make a very long drive back?

Would appreciate any input.
Thanks