Depending on the year of manufacture, the mounting points may differ.
Front bumper
-Unscrew the nuts in the wheel arches.
-around the perimeter of the lower part, we Unscrew the screws and pull out the pistons that attach the protection and the lower part of the bumper.
-Unscrew the four nuts that attach the bumper booster to the spars.
-with an assistant, we pull the bumper forward (look for the wires).
-disconnect the connectors from the fog lights.
Rear bumper
-open the trunk lid.
-in the opening of the trunk, we pull out the pistons.
-from the bottom side, we Unscrew the screws that attach the bumper to the panels.
-from the bottom side, we Unscrew two nuts on each side, which attach the sides of the bumper to the fenders.
-pull the bumper back (look for the wires).
-disconnect the Parking meter connectors (if present).
How to remove the front and rear bumper Lincoln Navigator (2003-2006)
How to remove the front and rear bumper Lincoln Navigator (2007-2017)