Yes, you can experience Battlefield 4 in third person mode.
As the title states
no
Nope.
In the car you can ((remembered how))
Only while inside a vehicle. You press c.
Why would you need it? It’s unclear without knowing the details.
Yes, there are mods available that let you achieve similar effects.
No, I can't do that.
The game is built for a first-person perspective. Changing it could result in a ban.
Don’t worry about the ban, let’s figure out how to identify the mode used. It should work for campaigns too.