Depending on the model year and body type of attachment are different.
Front bumper
-open the hood.
-under the hood, take out the clips and remove the trim above the grille.
-under the pickguard, Unscrew the screws, release latches and remove the grille.
-under the grille, Unscrew the screws (might be clips).
-on the perimeter in the bottom part Unscrew the screws (spun up).
-wrenched the wheel depending on which way we will analyse it first.
-wheel arches Unscrew the screws that attach the fender liner.
-remove the fender liner to the side and Unscrew three screws on each side holding the bumper corners to the wings.
-with the assistant gently pulls the bumper itself.
-remove the connector from the fog lamp (if any).
Rear bumper
-open the trunk lid.
-behind the side panels Unscrew the nut.
-remove rear trim.
-the plating Unscrew two nuts from each side.
-in the opening of the trunk take out the caps.
-Unscrew the screws in the wheel arches (so as not to remove the wheels easier to turn a ratchet with a nozzle).
-remove the fender liner to the side and Unscrew one nut on each side that attach the bumper corners to the wings.
-bottom-pull caps.
-with the assistant pulls the corners and gently pulls the bumper back.
How to remove front and rear bumper Ford Focus 2 (2004-2012)
How to remove front and rear bumper Ford Focus 3 (2010-2018)
How to remove front and rear bumper Ford Focus 4 (2018+)