Can't think of anything that could involuntarily make a car burn (a dropped/forgotten cigarette for example shouldn't be able to burn a car). What kind of "external factor" is Ford thinking of?
I'm just doing devil's advocate, wondering if there could actually be foul play;... or if Ford is actually just as bad as we all know they are.
Can't wait for Western cars to catch up with current Chinese battery safety standards so that these "EV catches fire" thing stops being a thing (even though EVs already burn down much less than traditional cars).