Will this work if my bumper sensors have holes in the lower valance?

This bar sits behind the fascia and won't block sensor cutouts. If your lower valance has existing sensor openings, they'll remain functional once the bar is bolted in place.

Do I need to remove the front bumper to install this?

Most installs don't require full bumper removal—you can access the mounting points from behind the fascia. Confirm bolt access on your specific vehicle before starting; some clips may need gentle removal first.

Should I paint this before or after installation?

Either works. Painting after install gives you a cleaner match to your bumper and avoids paint damage during bolt-down. If you prefer pre-paint, mask off the mounting holes and let primer cure fully before handling.