Does this come with park assist sensors?

No — the sensor provisions are pre-drilled to accept OEM or aftermarket sensors, but sensors are purchased separately. This is just the bumper end cap.

Will I need new fasteners to bolt this on?

Mounting method uses factory attachment points, so you'll likely reuse existing hardware. Have a set of new fasteners on hand in case originals are damaged during removal.

Does this bumper end interfere with a trailer hitch receiver?

That depends on your hitch receiver type and rear overhang setup — test-fit before committing. Some aftermarket receivers sit proud of the bumper surface; others tuck behind it. Measure your setup first.