Yes—EPA says the Clean Air Act supports access to emissions-related repair information and tools, while still prohibiting emissions-control tampering and defeat devices. The distinction is whether a control is temporarily disabled for a genuine repair and restored to proper operation, or left bypassed or inoperative. This is a summary of U.S. federal law and EPA guidance, not a state-by-state legal guide.
What does EPA mean when it says the Clean Air Act supports right to repair?
EPA’s guidance treats access to emissions-related repair resources as consistent with the Clean Air Act. For covered light-duty vehicles, light-duty trucks, and heavy-duty commercial trucks, EPA says manufacturers must provide emissions-related service information and training materials, on-board diagnostics (OBD) data and enhanced diagnostics, passthrough reprogramming information, and manufacturer-specific tools for purchase. EPA’s Freedom to Fix page was last updated July 1, 2026.
That access matters because independent shops and vehicle owners may need more than a basic code reader to diagnose or repair an emissions-related fault. A general OBD-II scanner, enhanced diagnostics, and manufacturer-specific tools are not interchangeable: compatibility and diagnostic depth vary by vehicle and tool. EPA identifies the categories of resources but does not endorse a particular scanner or establish that one consumer device will work with every vehicle.
Can emissions controls be temporarily disabled for a repair?
The Clean Air Act’s anti-tampering provisions prohibit knowingly removing or rendering an emissions-control device inoperative after a vehicle or engine has been sold. The statute includes a limited repair exception: disablement may be permissible when done to repair or replace the control, or as a necessary temporary step to repair another item, if the control is replaced upon completion and functions properly afterward. The statutory text sets out the prohibition and exception.
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In practical terms, purpose, duration, and outcome matter. A temporary step in a real repair is different from leaving the system disabled. EPA’s anti-tampering FAQ gives removal of a catalytic converter without replacement by an approved replacement as an example of tampering. The federal prohibitions also apply to vehicle owners, repair businesses, and manufacturers.
| Question | Repair activity | Emissions-control defeat |
|---|---|---|
| Purpose | Repair or replacement of a control, or a necessary temporary step to repair another item | Bypass or defeat of a regulated control |
| Duration | Temporary while repair work is performed | Continued disablement or installation of a device that defeats the control |
| Result | The control is restored and functions properly after the work | The control is left inoperative or bypassed |
The statute also restricts manufacturing, selling, offering for sale, or installing parts whose principal effect is to bypass, defeat, or render inoperative regulated emissions controls, subject to the statute’s wording and knowledge requirements. Repair access does not make permanent removal or a defeat device lawful. This article does not provide instructions for bypassing an emissions system.
What diagnostic information and tools must manufacturers provide?
Under EPA’s current on-road guidance, the covered categories are light-duty vehicles, light-duty trucks, and heavy-duty commercial trucks. For those categories, EPA identifies the following emissions-related resources manufacturers must make available:
- Service information and training materials
- OBD data and enhanced diagnostics
- Passthrough reprogramming information
- Manufacturer-specific tools for purchase
The guidance describes resource access, not a guarantee that every repair can be completed with a generic scanner or without specialized equipment. Check that any diagnostic tool supports the vehicle and the work you need to do; EPA’s materials do not recommend a particular product.
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Does EPA’s enforcement policy create an exemption?
No. EPA’s November 23, 2020 enforcement policy describes enforcement discretion where a person has a documented, reasonable basis to conclude that conduct does not adversely affect emissions. That policy does not erase the statutory requirements or give advance approval to a particular repair, modification, or part. EPA’s stated aim was to protect health and the environment without unduly restraining aftermarket sales and service. The EPA memorandum explains the policy.
How does EPA’s 2026 guidance address farm and nonroad equipment?
EPA’s 2026 announcement addresses farmers and owners of nonroad diesel equipment, including agricultural machinery. EPA framed the guidance as clarification that the Clean Air Act supports repair; it said the guidance does not change the law, weaken emissions standards, or reduce compliance obligations. Read EPA’s announcement. This nonroad guidance is separate from the on-road vehicle categories listed on the Freedom to Fix page.
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Why does EPA emphasize anti-tampering?
EPA attributes an estimate of more than 570,000 tons of excess nitrogen oxides (NOx) and 5,000 tons of excess particulate matter to known defeat-device sales for certain diesel trucks after 2009 and before 2020, over those trucks’ lifetimes. The estimate comes from an EPA Air Enforcement Division study cited on EPA’s vehicle and engine enforcement page; that page does not state a publication year for the estimate. It concerns that specific population and time window, not all vehicles or all modifications.
Quick Recap
What should owners and independent shops take from the guidance?
- Use emissions-related service information and diagnostics to identify and repair faults, including by seeking manufacturer-specific resources when needed.
- Keep any temporary disablement limited to what is necessary for the repair, then restore the control so it functions properly.
- Do not treat right-to-repair guidance or enforcement discretion as permission to leave emissions controls disabled or install defeat devices.
- Check state and local requirements as well as federal law; this federal summary does not cover every state rule.
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