Promoting Automotive Repair, Trade, and Sales Act of 2013 or PARTS Act - Makes it not an act of infringement, with respect to a design patent that claims a component part of a motor vehicle as originally manufactured, to: (1) make, test, or offer to sell within the United States, or import into the United States, any article of manufacture that is similar or the same in appearance to the component part claimed in such design patent if the purpose of such article is for the repair of a motor vehicle to restore its appearance to as originally manufactured; and (2) use or sell within the United States any such same or similar articles for such restorations more than 30 months after the claimed component part is first offered for public sale as part of a motor vehicle in any country.

Defines "component part" as a component part of the exterior of a motor vehicle only (such as a hood, fender, tail light, side mirror, or quarter panel), excluding an inflatable restraint system or other component part located in the interior of a motor vehicle.

Specifies that an offer to sell includes any marketing of an article of manufacture to prospective purchasers or users and any pre-sale distribution.

Applies this Act to any patent issued, or application filed, before, on, or after the effective date of this Act.