The U.S. Environmental Protection Agency (EPA) advanced the right of American farmers and equipment owners to repair their farm and other nonroad diesel equipment through new guidance released today. This directive clarifies that the Clean Air Act (CAA) actively supports, rather than restricts, independent repair capabilities, specifically preventing manufacturers from using the CAA to justify limiting access to diagnostic tools or proprietary software.
This clarification is crucial for agricultural productivity, as timely and affordable maintenance is essential for critical activities like planting and harvesting, according to the EPA announcement. Administrator Lee Zeldin stated that manufacturers had wrongly monopolized repair markets by misinterpreting the CAA, asserting that the agency is now aligning with the law as written to secure a more independent future for US agriculture.
For years, equipment manufacturers interpreted the CAA’s emission control anti-tampering provisions as a barrier to sharing necessary diagnostic tools with the public. This forced farmers into using only manufacturer-authorized dealers, increasing costs and prompting some agricultural operations to rely on older, less emissions-compliant machinery that they could service independently.
The EPA’s new guidance does not alter existing environmental law or weaken emission standards for diesel engines. Instead, it confirms that temporary overrides of emission control systems are permissible under the CAA when necessary for the “purpose of repair” to restore proper machinery functionality.
This clarification specifically applies to advanced emission control systems found on modern agricultural equipment, including Selective Catalytic Reduction (SCR) and Diesel Exhaust Fluid (DEF) systems. The agency stressed that farmers are not legally obligated to rely exclusively on authorized dealers for maintenance and repairs.
This regulatory action follows a request submitted by John Deere on June 3, 2025, asking the EPA to confirm that temporary emission control overrides are permissible under the statute. The guidance is also intended to assist truckers and other diesel equipment operators by preventing sudden shutdowns related to emissions system faults.
By expanding consumer choice and empowering farmers to perform timely maintenance, the EPA expects this action will encourage the continued adoption of newer farm equipment. This underscores the agency's dual commitment to supporting American farmers while upholding its core environmental protection mission.
