Ive had problems with the starter wires falling off their connections. Easy fix once it was found
I had the ignition lock cylinder detach itself from the switch ( Engine wont shut off with key )NOT an easy fix, and no doubt the dealer would charge a hefty price to fix, if your mechanically inclined you could fix it, if not good luck preventing yourself from scrappin it.
These are the only probs Ive had.
Best design body wise for a Taurus, it still looks sharp at nearly 10 years old.
Good low end torque offset however by weak hp at freeway and passing speeds.
Its loaded with features.