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Short answer: EPA’s February 2, 2026, guidance says the Clean Air Act (CAA) does not require farmers to use an authorized dealer for repairs on agricultural and other nonroad diesel equipment. Manufacturers may not cite the CAA as a reason to withhold repair tools or software from owners and independent repair providers. The clarification also recognizes that emissions-control functions may sometimes need to be temporarily disabled during a legitimate repair, provided the machine is restored to proper operation.
This is an agency interpretation, not a new federal right-to-repair statute. It does not make permanent DEF, SCR, DPF, or inducement defeats lawful, require free diagnostic tools, or guarantee immediate access to every proprietary software function.
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What EPA issued on February 2, 2026
EPA issued IACD-2026-01, titled “Clarification Regarding the Practice of Temporarily Disabling Aspects of an Emission Control System or Components to Repair or Maintain a Nonroad Engine.” It covers nonroad diesel engines and equipment, including agricultural machinery, mobile construction equipment, and locomotives.
EPA’s announcement says the CAA’s anti-tampering provisions should not be interpreted as preventing an owner or independent shop from carrying out a repair. Manufacturers also may not use the CAA as a justification for withholding repair tools or software that would allow that work. The agency describes the document as a clarification of existing requirements and policy; it expressly says the guidance does not have the force and effect of law. Read the agency’s summary at EPA’s February 2 release.
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The immediate trigger was a June 3, 2025, request from John Deere asking EPA to confirm that temporary emissions-control overrides could be used during repairs. Deere’s request and EPA’s broader position are separate facts: the request does not establish that Deere supports every proposal associated with right-to-repair legislation.
What “temporary override” means—and what it does not mean
Modern diesel systems can make diagnosis difficult when a fault causes a machine to enter an inducement or derate mode. A technician may need to temporarily disable or override an emissions-related function to identify a fault, replace a component, or complete a maintenance procedure. EPA’s interpretation addresses that narrow repair situation.
The four conditions that matter
- Legitimate purpose: the action must be connected to diagnosing, repairing, or maintaining the equipment.
- Temporary duration: an override cannot become the operating configuration.
- Restoration: the emissions system and the machine must be returned to proper functioning after the work.
- Continued compliance: the guidance does not authorize operation with defeated controls or a calibration that increases emissions.
A modification intended to permanently evade emissions requirements remains outside the clarification. EPA has not authorized emissions-delete kits, permanent SCR or DEF bypasses, altered calibrations, or continued operation in a noncompliant state.
Why DEF, SCR, and inducement faults are central
Selective catalytic reduction (SCR) systems inject diesel exhaust fluid (DEF) to reduce nitrogen-oxide emissions. A machine can set faults for DEF quality, dosing, sensors, wiring, pumps, or related components. Many systems respond with inducement strategies that reduce engine power or vehicle speed when a problem is not corrected.
EPA separately reported that some DEF-related failures had reduced equipment performance to nearly unusable speeds and sought failure data from major manufacturers in February 2026. That action is related context, not a change that makes a permanent DEF bypass legal. Details are in EPA’s DEF announcement and the agency’s DEF resource page.
The timing matters most during planting, harvest, and other short operating windows. If an authorized dealer is distant or unavailable, access to legitimate diagnostic information and an independent technician can reduce downtime. EPA’s guidance does not promise that access will be immediate or inexpensive; it removes the CAA as the stated legal reason for denying it.
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What equipment and repairs are covered
Coverage turns on the equipment’s legal classification and emissions system, not simply on whether a machine is used on a farm. The February document is aimed at nonroad diesel engines and equipment. A farm-operated on-road truck is a different category, and later EPA action addresses a broader set of vehicles and equipment.
| Situation | How the February guidance applies |
|---|---|
| Temporary emissions-system disablement needed to diagnose or repair a nonroad diesel engine | Within the clarification if the work is legitimate, temporary, and followed by restoration of proper operation. |
| Permanent DEF, SCR, DPF, or inducement defeat | Not authorized; remains potentially prohibited tampering. |
| Request for OEM diagnostic software or service information | EPA says the CAA is not a valid justification for withholding access, but the guidance sets no universal price, format, or delivery deadline. |
| Warranty claim after owner or independent repair | Separate issue governed by warranty terms and other law; the guidance does not guarantee coverage. |
| On-road vehicle or equipment | Do not assume the February nonroad guidance controls. EPA issued broader “Freedom to Fix” guidance on July 1, 2026. |
What farmers can realistically do now
- Identify the machine: record the make, model, model year, engine, emissions tier, and whether it is classified as nonroad equipment.
- Document the symptom: save fault codes, warning messages, derate status, operating hours, and photographs before clearing anything.
- Ask for the access path: request the service manual, diagnostic interface, software subscription, security credentials, and procedures available to an owner or independent shop.
- Ask whether an override is necessary: have the dealer or technician identify the repair function that requires temporary disablement and how normal operation will be restored.
- Use qualified help for high-risk work: emissions calibration, high-pressure fuel systems, electrical isolation, and safety-critical controls can create injury, fire, or equipment risks.
- Verify restoration: obtain a diagnostic report showing that the repair is complete, emissions controls are active, and inducement faults have been properly cleared.
- Keep records: retain invoices, software and tool receipts, calibration details, parts numbers, test results, and communications about access.
If a dealer says only an authorized technician may perform the work, ask for that position in writing and request the specific warranty term, safety rule, or law being relied on. A business policy is not automatically a Clean Air Act requirement. Conversely, EPA’s interpretation is not blanket immunity if a repair leaves the machine noncompliant.
What the guidance does not provide
- No complete federal right-to-repair law: EPA did not create a statutory entitlement covering every tool, part, password, or software feature.
- No free-access mandate: the document does not establish prices, subscriptions, response times, or a standardized delivery method.
- No automatic access to protected functions: manufacturers may still apply legitimate safety, cybersecurity, licensing, or authentication controls, which could become subjects of future disputes.
- No emissions exemption: permanent defeat devices, altered emissions calibrations, and knowingly noncompliant operation remain outside the clarification.
- No warranty guarantee: the ability to perform a repair and the right to have that repair paid under a warranty are different questions.
- No override of other law: state right-to-repair statutes, environmental rules, safety requirements, contracts, and insurance conditions may impose additional obligations.
The National Farmers Union welcomed EPA’s clarification but said administrative guidance does not guarantee a farmer’s right to repair and continued to call for federal legislation. Its response is available at NFU.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Industry and farm-group reactions
National Farmers Union
NFU supports more repair choice and less dependence on a single dealer, while treating legislation as necessary for a durable, enforceable right.
AGCO
According to a reaction roundup by Successful Farming, AGCO welcomed the guidance and said it has long supported responsible farmer repair and farmer control of farm-generated data.
John Deere
EPA identifies Deere’s June 2025 request as the catalyst for the clarification. That establishes Deere’s request for an agency interpretation, not blanket endorsement of every access demand or legislative proposal.
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Other manufacturers and farm advocates
The same coverage reported reactions from farm organizations and equipment stakeholders, including advocates who viewed the clarification as removing a major barrier to self-repair. The Association of Equipment Manufacturers represents agricultural and construction equipment manufacturers and supply-chain partners; one company’s statement should not be treated as the position of every member.
How this fits EPA’s broader timeline
- August 2025: EPA issued earlier guidance concerning DEF-related inducement strategies.
- February 2, 2026: EPA announced IACD-2026-01 for temporary emissions-system disablement during nonroad repair.
- February 3, 2026: EPA announced additional DEF-related measures and manufacturer data requests.
- March 2026: EPA issued later guidance on alternate sensor technologies, which should not be treated as proof that the February letter changed every DEF rule.
- July 1, 2026: EPA issued broader “Freedom to Fix” guidance for on-road vehicles and equipment. See EPA’s July 1 announcement.
This sequence is best understood as a policy clarification and change in emphasis, not a repeal of emissions standards or an across-the-board statutory right.
What happens next
The practical test will be implementation. Owners and independent shops may still encounter expensive software, limited model coverage, authentication requirements, scarce parts, or dealers that interpret access narrowly. Disputes are likely to focus on whether terms are reasonable, whether a requested function is genuinely needed for repair, and whether a security or safety restriction is legitimate.
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Manufacturers may adjust tool programs and documentation; Congress and state legislatures may pursue broader right-to-repair laws; and EPA’s interpretation could be challenged, narrowed, or superseded. Keep the February guidance distinct from the July action, and evaluate each machine under its classification, warranty, and applicable state law.
The bottom line is practical: a farmer should not accept “the Clean Air Act forbids anyone else from repairing this machine” as a complete answer. EPA says the CAA does not require exclusive dealer repair and allows temporary emissions-system disablement when genuinely necessary for a lawful repair. The owner or technician must still finish the job, restore the emissions system, and return the equipment to compliant operation.
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