P0121 and the red triangle.

So I replaced my battery about 20k miles ago, so I know that's fine. I always throw a P0420, but I'm told that's fine too. So I was driving, and I lose power suddenly. The red triangle comes on, and I plug my scangauge II in, which tells me it's P0121, or the throttle body sensor. I reset the codes to make it home - my battery DID charge just fine on the way home, making it up to a 63.5 state of charge. Now when I start it, and press the gas, it tends to rev up, rev down, and repeat. I haven't gotten the red triangle again yet but I also haven't driven it since then.

The car is an '06 Prius and has about 220k miles on it. Is it actually the throttle body? Should I clean it? Replace it? Might it be something else, like a pedal sensor? Thanks for reading.

 

Cleaned the MAF/throttle body. Haven't driven it around much yet, but they were definitely dirty. I'll drive it around now and see what's up - thanks for the advice.

Edit: Just gained like 10-15MPG. So, to everyone reading this...go clean your MAF/throttle body.