The U.S. Environmental Protection Agency (EPA) last week issued guidance that drops the requirement for Diesel Exhaust Fluid (DEF) sensors as part of a truck's aftertreatment system and allows truck ...

Evan Williams is an automotive journalist and mechanical engineering technologist with more than a decade of experience in the industry. He has written for the Toronto Star and AutoTrader Canada and ...

EPA approved guidance allowing diesel manufacturers to replace urea quality sensors with NOx sensors in DEF systems. The agency said faulty DEF sensors are a significant source of warranty claims and ...

President Donald Trump and the U.S. Environmental Protection Agency announced guidance allowing the removal of the DEF sensor requirement for all diesel equipment. EPA said sudden speed losses caused ...

The EPA is targeting faulty DEF sensors with new guidance allowing a different type of sensor to monitor NOx emissions in diesel engines. In the Trump administration’s latest steps to address the ...

The Environmental Protection Agency announced on March 27, 2026, that it is removing the diesel exhaust fluid sensor requirement for all diesel equipment, a decision the agency frames as a direct ...

The U.S. Environmental Protection Agency on Friday said it is dropping the requirement for diesel exhaust fluid (DEF) sensors as part of a truck's aftertreatment system in favor of monitoring actual ...

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 ...

The United States Environmental Protection Agency has changed its tune on diesel trucks under the current administration. Whereas previous versions of the EPA pursued massive penalties and even ...

Def Leppard has released a high-voltage new song titled "Rejoice." You can listen to it below. The standalone single is being released to celebrate the band's upcoming Las Vegas residency, which kicks ...