No federal law requires a vehicle manufacturer to keep making replacement parts, and no single statute guarantees you can get parts for your car indefinitely. What actually exists is a patchwork: laws that require free repairs during safety recalls, an eight-year warranty on major emissions components, protections against having your warranty voided for using aftermarket parts, and a set of newer rules around software locks and repair access. Taken together, these are the laws requiring vehicle replacement parts availability in the United States, and understanding where each one stops is as important as knowing what it covers.
Manufacturers Are Not Required to Keep Making Parts
This is the fact that surprises most owners. NHTSA has stated directly that “there is no provision in the Safety Act or in any of our safety standards or other regulations that requires a manufacturer to make replacement parts available for any particular period of time, or, for that matter, at all.”1National Highway Traffic Safety Administration. Interpretation ID: time.replcepart.Pollak.12-03
Most major manufacturers voluntarily stock parts for roughly ten years after a model ends production, because doing so supports their dealer networks and keeps customers. That is a business choice, not a legal duty. Once a manufacturer stops producing a part, your options are aftermarket suppliers, salvage yards, or specialty remanufacturers. For older or less common vehicles, that gap can make some repairs impossible or too expensive to be worth it.
When Manufacturers Must Provide Parts: Safety Recalls
The one area where federal law actually forces a manufacturer to supply a replacement part is a safety recall. Under 49 U.S.C. § 30120, when a safety-related defect or noncompliance with a federal safety standard is identified within ten years of the vehicle’s original sale, the manufacturer must provide a free remedy. That remedy can be a repair, a replacement vehicle, or a refund.1National Highway Traffic Safety Administration. Interpretation ID: time.replcepart.Pollak.12-03
The law also puts a clock on the fix. If a manufacturer fails to adequately repair a vehicle within 60 days of the owner presenting it for service, that delay is treated as presumptive evidence of unreasonable delay. NHTSA can extend the window for good cause, but only if the extension is published in the Federal Register before the original period expires. Where NHTSA finds a recall program cannot be completed within a reasonable time, it can order the manufacturer to expand parts supply or increase the number of authorized repair facilities.2GovInfo. 49 USC 30120 – Remedies for Defects and Noncompliance
One boundary: manufacturers must notify owners, purchasers, and dealers about safety defects with no time limit, but the free-remedy obligation expires after ten years. A recall notice on a 15-year-old vehicle does not come with a free fix.
Aftermarket Parts and Your Warranty
The Magnuson-Moss Warranty Act, enacted in 1975, prohibits a manufacturer from conditioning your warranty on using parts identified by a specific brand or company name, unless the manufacturer provides those parts at no charge.3Office of the Law Revision Counsel. 15 USC Ch. 50 – Consumer Product Warranties A dealership cannot refuse to honor your powertrain warranty because you installed an aftermarket air filter or had an independent shop change your oil.
The exception is narrow. The FTC can grant a waiver if a manufacturer proves the product genuinely will not function properly without its specific branded part, and the FTC finds the waiver serves the public interest.4Office of the Law Revision Counsel. 15 USC 2302 – Rules Governing Contents of Warranties These waivers are rare, and most manufacturers never apply for one.
The rule is still being violated. In 2018 the FTC sent warning letters to six major companies for warranty language that effectively conditioned coverage on using only the manufacturer’s own parts and services, including statements like “use of [company] parts is required to keep your warranties intact.”5Federal Trade Commission. FTC Staff Warns Companies That It Is Illegal to Condition Warranty Coverage on Use of Specified Parts or Services If a dealer tells you an aftermarket part voided your warranty, that claim is almost certainly wrong unless the aftermarket part itself caused the failure.
Eight-Year Emissions Warranty on Major Components
Federal emissions regulations create the longest guaranteed coverage on any category of parts. Under EPA rules, standard passenger vehicles carry a general emissions defect warranty of two years or 24,000 miles, but the following major emissions components are warranted for eight years or 80,000 miles, whichever comes first:6eCFR. 40 CFR 85.2103 – Emission Warranty
- Catalytic converters and SCR catalysts, including related components in the catalytic system
- Particulate filters and traps on gasoline and diesel engines
- Exhaust gas recirculation components on diesel engines
- The emission control module that manages emissions systems
- EV and plug-in hybrid batteries, including the pack and the components needed to charge, store, and deliver power to move the vehicle
These are among the most expensive parts on a modern vehicle. A catalytic converter replacement can easily exceed $1,000, and an EV battery pack costs many times that. If one of these components fails within the warranty period and causes the vehicle to exceed emissions standards, the manufacturer must fix it at no cost. Medium-duty vehicles get five years or 50,000 miles for general emissions parts, with the same eight-year or 80,000-mile protection on major components.7eCFR. 40 CFR 85.2103 – Emission Warranty
Software Locks and the Right to Bypass Them for Repair
Modern vehicles run on software, and manufacturers protect that software with digital locks. Section 1201 of the Digital Millennium Copyright Act makes it illegal to bypass a technological measure that controls access to a copyrighted work.8Office of the Law Revision Counsel. 17 USC 1201 – Circumvention of Copyright Protection Systems Because vehicle software is copyrighted, manufacturers have long argued that breaking a digital lock to perform a repair violates federal law.
Every three years the Librarian of Congress can grant exemptions to that rule. The most recent rulemaking, finalized in October 2024, includes two exemptions that directly affect vehicle repair:9Federal Register. Exemption to Prohibition on Circumvention of Copyright Protection Systems for Access Control Technologies
- You can bypass digital locks on software in a vehicle you lawfully own when doing so is a necessary step for diagnosis, repair, or lawful modification of a vehicle function. This covers personal automobiles, commercial vehicles, agricultural equipment, and marine vessels.
- Vehicle owners and lessees, or anyone acting on their behalf, can bypass digital locks to access, store, and share operational data, including diagnostic and telematics information.
Two caveats matter. These exemptions are not a defense against other laws, so if bypassing a lock also violates a Department of Transportation or EPA rule, the DMCA exemption will not save you. And the exemptions must be renewed every three years, meaning they could disappear in a future rulemaking.
Patents on Replacement Parts
Patent law is where the fight over parts availability gets most intense. The Supreme Court’s 2017 decision in Impression Products, Inc. v. Lexmark International, Inc. held that once a manufacturer sells a patented product, its patent rights in that specific item are exhausted: “Once a patentee decides to sell — whether on its own or through a licensee — that sale exhausts its patent rights, regardless of any post-sale restrictions the patentee purports to impose.”10Supreme Court of the United States. Impression Products Inc v Lexmark International Inc (05/30/2017) So a manufacturer cannot use patent law to stop you from repairing, modifying, or reselling a product you bought. What exhaustion does not do is let third parties manufacture new copies of a patented part.
Design patents are a bigger problem for parts availability. Utility patents protect how something works; design patents protect how it looks. Manufacturers increasingly hold design patents on exterior body panels such as hoods, fenders, bumpers, and headlight housings, which lets them block aftermarket companies from producing collision parts that restore a vehicle’s original appearance. Because collision repair needs parts that look like the original, a design patent on that appearance is effectively a monopoly, and prices for those parts stay high.
The SMART Act would have carved out an exception for aftermarket parts made to restore original appearance, with an 18-month exclusivity period for the original manufacturer.11Congress.gov. SMART Act Clarifications The bill died in committee in 2023 and has not been reintroduced as of 2026.
State Right-to-Repair Rules and Insurance Disclosure
States have moved to fill federal gaps, mostly under the right-to-repair banner. A handful have enacted automotive right-to-repair laws requiring manufacturers to share diagnostic tools, repair manuals, software updates, and parts availability with independent shops on terms reasonably comparable to what dealers get. Some extend the requirement to telematics data, the wireless diagnostic and performance information modern vehicles transmit.
The industry’s voluntary answer, a 2014 Memorandum of Understanding between automakers and the independent repair community, has not held up. Congressional testimony in January 2026 described it as “a voluntary, non-binding, unenforceable framework” that “does not address current vehicle technologies and does not guarantee the vehicle owner the right to repair.”12House of Representatives. Responses to Additional Questions for the Record – Subcommittee on Commerce, Manufacturing, and Trade
On the insurance side, most states require disclosure when an insurer specifies aftermarket parts for a repair. The estimate typically must identify each non-OEM part and include a notice explaining that the replacement comes from a source other than the vehicle’s manufacturer and carries the parts manufacturer’s warranty rather than the vehicle manufacturer’s. Some states prohibit aftermarket crash parts on current-model-year vehicles or require the owner’s explicit permission before non-OEM parts are used. The specifics turn on your state’s insurance code.
Pending Federal Legislation
The most significant pending federal proposal is the REPAIR Act (H.R. 1566), introduced in February 2025. It would require vehicle manufacturers to give independent repair shops access to diagnostic information, tools, and repair data.12House of Representatives. Responses to Additional Questions for the Record – Subcommittee on Commerce, Manufacturing, and Trade The bill targets the core complaint from independent shops: that even when aftermarket parts exist, shops cannot install them properly without manufacturer-controlled software and calibration tools. It does not cover modification or customization, so its scope is maintenance and restoration of original function. As of early 2026, the bill has not advanced out of committee.