I have my car in the shop where I bought it. I am a little behind on my payments but I just made a payment the day it broke down a week ago. I only owe $279 on it now. I told the guy when I get paid I want to pay it off then wait until I get paid again to pay for the repairs. Just getting scared they're going to put it on their lot and sell it after I've paid on it for a year and a half.
Short answer, yes they could repo. But being only one payment behind AND having talked to them to make arrangements means you have little to worry about, for now.