My car alarm occasionally sounds for no apparent reason, even if I just lock the doors manually (2008 Fusion). Does anyone know what the cause might be?

Bad sensor The dealer can tell you which one or a loose connection

I would reset your computer in the car. Just disconnect the positive on the battery, wait about five minutes then connect. If that doesn't work then I would take it to a ford dealer, just not Berge. I've personally have had a horrible experience there.