Diesel exhaust fluid is essential for keeping your engine functioning without letting off too many emissions. But it doesn't ...

Selective catalyst reduction (SCR) systems were introduced in 2010 in the United States to meet the NOx requirements. With an ...

Diesel engines across agriculture, trucking and construction have been sidelined by a tiny part that was supposed to keep the ...

Wyoming's most famous diesel mechanic, his techy son, and a third well-known mechanic who suffered federal prosecution all ...

New guidance allows engine makers to replace problematic DEF sensors with NOx-based systems, aiming to reduce unnecessary ...

The rules require diesels to emit 82.5 percent fewer oxides of nitrogen, or NOx, cutting it to 0.035 grams per ...

Austin Turner is a web producer at CBS News Los Angeles. An Inland Empire native, Austin earned a degree in journalism from San Jose State University in 2020. Before joining CBS News in 2025, he ...

The Iowa House advanced a bill Monday that would allow farmers to disable the diesel exhaust fluid, or DEF, systems required by federal emissions laws. House File 2529 would require manufacturers of ...

The Environmental Protection Agency hit the ground running in 2026, taking a sledgehammer to truck emission rules, including diesel exhaust fluid (DEF) and California regulations. When it comes to ...

The EPA’s war on the dreaded diesel “limp mode” triggered by DEF systems just shifted into a much higher gear. While the initial focus centered on cleaning up the software for the 2027 model year and ...

A southeast Kansas farmer says he’s relieved that the U.S. EPA is taking steps to address long-standing concerns about DEF system failures. “They’re just so unreliable.” Ben Bellar says an issue with ...

The U.S. Environmental Protection Agency (EPA) is escalating its response to consumer complaints regarding Diesel Exhaust Fluid (DEF) system failures, announcing a new investigation aimed at major ...