What type vehicle is it?
Does it have adjustable air suspension? If so, you may have blown an air line off or possibly have damage to the pump itself.
The is sensor in the front on the firewall under the hood its about 200 dollars you may need to reolace it, it is for the air ride control but this info is only useful if the whole front is nose down both wheels if not then YOU need to reset the bag that low by the computer or replace it cause ot could have a hairline crack in it
Looking for a Used Navigator in your area?
CarGurus has 5,614 nationwide Navigator listings starting at $1,900.
Search Lincoln Navigator Questions
Lincoln Navigator Experts