Trump Signals More DEF Rollbacks, Pushes Manufacturers to Lower Equipment Costs

In front of a gathering of farmers, ranchers and growers at the White House, President Trump and EPA announced new guidance that will remove the DEF sensor requirements, which the Small Business Administration (SBA) estimates will save farmers $4.4 billion a year and translate into $13.79 billion for Americans. Administrator Lee Zeldin says the move impacts farmers, truckers, motor coach operators and other diesel equipment operators.

“I have heard from truck drivers, farmers and many others complaining about DEF and pleading for a fix in all 50 states I visited during my first year as EPA administrator,” Zeldin says. “Americans are justified in being fed up with failing DEF system issues. EPA understands this is a massive issue and has been doing everything in our statutory power to address this. Today, we take another step in furthering our work by removing DEF sensors. Farmers and truckers should not be losing billions of dollars because of repair costs or days lost on the job.”

New Guidelines Focus on DEF Sensors

EPA says that sudden speed losses and shutdowns caused by DEF system failures compromise safety and productivity. It calls the issue unacceptable and problematic. In a release, EPA says it plans to continue to pursue all legal avenues to address Americans’ complaints. On Feb. 3, 2026, EPA demanded critical data on DEF system failures from the manufacturers that account for over 80% of all products used in DEF systems. This information will arm EPA with what it needs to permanently address DEF system failures. Thus far, the agency has received data from 11 of the 14 manufacturers, and in less than a month, EPA has turned around preliminary findings to issue today’s guidance, demonstrating Administrator Zeldin’s commitment to fixing this issue.

“Today, by eliminating DEF mandates, the Trump Administration is taking yet another step to free up hardworking Americans to focus on the vital work of feeding, clothing, building, and fueling our nation,” says SBA Administrator Kelly Loeffler. “I applaud Administrator Zeldin for his leadership on this issue, and I look forward to our continued collaboration to cut red tape for small businesses across the U.S. food supply chain.”

Several ag equipment manufacturers were highlighted during the event at the White House, including John Deere. The company weighed in EPA’s latest announcement about DEF.

“John Deere applauds the EPA’s leadership to provide as much flexibility through agency guidance as possible to limit the frequency of false DEF-quality inducements,” says Kyle Gilley, vice president for global government affairs at John Deere. “Today’s announcement builds upon EPA guidance from February 2026, requested by John Deere, to provide farmers additional tools to complete emissions-related repairs. These announcements are a win for farmers and their ability to keep modern equipment operating in the field.”

EPA says the preliminary review of the warranty data suggests that DEF sensor failures are a significant source of warranty claims and DEF-related inducements. The agency’s new guidance makes clear that under existing regulations, manufacturers can stop inaccurate DEF system failures by removing traditional emission sensors, known as Urea Quality Sensors, and switching to nitrous oxide (NOx) sensors.

EPA also affirms that approved NOx sensor-based software updates can be installed on existing engines without being treated as illegal tampering under the Clean Air Act. This is in line with EPA’s February 2026 Right to Repair clarification guidance, which removed a major barrier keeping farmers from fixing their faulty DEF systems in the field. EPA anticipates the switch will greatly curb errors that traditional sensor technologies have been prone to and reduce the issues Americans face with inaccurate DEF failures.

For more information, see EPA’s Diesel Exhaust Fluid.

Trump Calls on Manufacturers to Lower Equipment Prices If DEF Rolled Back

During Friday’s event, Trump also spoke about the rising complexity and cost of modern farm equipment.

“When you buy a tractor today, you spend 50 percent of your time fixing the environmental — I say environmental impact statement garbage that’s on the tractor,” he says.

He adds that equipment often includes computerized systems that can shut down tractors unnecessarily, increasing repair costs.

“I said to the head of John Deere, ‘Is this a good thing or a bad thing?’ He said, sir, you have no idea how bad it is. It’s made our tractors so complicated. … We want to go back to the old ways, sir. And I said, I agree with you 100 percent.”

The president says the administration is looking into further rolling back DEF requirements, but as he does, he is also urging manufacturers to reduce equipment prices for farmers if the added environmental regulation costs are no longer there.

“Lee (Zeldin), I think we can say, I know you’re in the process of cutting out massive amounts of nonsense that are mandated to be put on your tractors, that all of your trucks that cost your fortune…and I know that they’re going to do this. And I asked one thing, you got to promise me one thing. You’re not going to take any profits. You’re going lower the cost of a tractor. I want you to lower the costs. And if they don’t lower the course, you’ll let me know. And I’ll have to do a big number of those companies. Okay? They’re going to be able to, very shortly, produce a bigger, better tractor and substantially less money. It’s going to be better. It’s gonna be a better tractor at substantially less,” Trump says.

He adds that future tractors will be simpler, more reliable and less expensive.

“I want John Deere and Case and all of the great companies … to give it to you in the form of lower tractor and equipment costs. And I think it’s going to have a huge impact,” he says.

President Trump then directed EPA Administrator Zeldin to explore ways to require, or mandate, manufacturers to lower the cost of farm equipment.

EPA’s guidance issued on Friday is part of a broader effort to address complaints from farmers, truckers and other diesel equipment operators about DEF system failures that cause equipment shutdowns, but Trump says more action on DEF is currently underway.