Ok, so the check engine light comes on my 2007 Chevy Aveo. It has 56K miles. I take it to Autozone and they check the code. It comes up P2138, APP sensor 1 and APP sensor 2 signal voltage fault. It lists as a probably cause "poor electrical connection."

Here's the question: Where is this thing, and how can I check if it has a poor electrical connection? Replacement will probably have to be done elsewhere, but seems like a connection shouldn't be too hard to DIY.

Any help is appreciated. Thansk!!!