PolicyBrief
S. 4679
119th CongressJun 3rd 2026
A bill to amend title 49, United States Code, to allow the introduction of certain noncompliant motor vehicle equipment in interstate commerce for testing purposes, and for other purposes.
IN COMMITTEE

This bill extends federal prohibitions on manufacturing, selling, and importing noncompliant motor vehicles to also cover noncompliant motor vehicle equipment for testing purposes.

Gary Peters
D

Gary Peters

Senator

MI

LEGISLATION

Proposed Safety Update Extends Federal Standards to Car Parts: New Rules for Interstate Equipment Trade

This bill updates federal transportation law by closing a loophole that treated whole cars differently than the parts used to build or repair them. Specifically, it amends Section 30112(b)(10) of title 49 to ensure that the same strict prohibitions on manufacturing, selling, or importing vehicles that fail to meet safety standards now apply explicitly to individual items of motor vehicle equipment. While the law already cracks down on noncompliant cars, this change ensures that the components—think brakes, lighting, or tires—are held to the same legal scrutiny before they hit the market.

Closing the Parts Gap

Currently, federal law is crystal clear about not selling a car that doesn't meet safety benchmarks. However, the language regarding individual equipment has been less robust. By adding the phrase "item or items of motor vehicle equipment" into the existing prohibitions, the bill ensures that a manufacturer or importer cannot bypass safety regulations just because they are selling a component rather than a finished vehicle. For a local mechanic or a DIYer working in their garage, this means the legal framework is tightening to ensure that the replacement parts you buy at a retail store or online have been vetted against the same federal safety yardstick as a brand-new car on the lot.

Testing the Limits

Beyond just tightening the rules, the bill introduces a specific pathway for testing. It allows for the introduction of certain noncompliant equipment into interstate commerce if—and only if—it is strictly for testing and evaluation purposes. This is a practical nod to innovation. Imagine a tech company developing a new type of high-efficiency headlight that hasn't been approved under current 1970s-era standards yet. Under this provision, they could legally transport those prototypes across state lines to a testing facility without breaking the law. It creates a controlled environment where new tech can be proven safe before it’s ever allowed to be sold to the general public.