Just made an account to tell you. Just throw the red tool box in garage at the ATV. Youll hear a tool sound and it gets fixed. (Uses 1 use of toolbox btw)
There's a couple toolboxes on the map - one is in the garage, another one is in one of the transformer housings. The latter has two or three uses, though, but it's better than nothing.
You can also buy them with the little credits you earn, but you'll have to walk back to base to get it and wait and walk back and so on.
