Do the parking sensor holes line up with my OEM sensors?

Yes. This grille is designed with factory sensor cutouts. Your existing parking sensor modules will sit behind the grille without modification—just verify alignment during test-fit before final fastening.

Will I need to prep or paint this before installing?

The matte black finish is ready to bolt on. If your bumper is a different finish or color, light surface prep and a protective clear coat will help blend the grille into your front end.

What hardware do I need to mount this?

Mounting hardware is not included. You'll need fasteners appropriate for your front bumper assembly—check your A3's service manual or have a shop verify the mounting points during install to avoid drilling mistakes.