What Is DEF and How Does It Work? - MotorTrend
Jul 29, 2024 · What Is DEF? Diesel exhaust fluid is an automotive-grade combination of urea and deionized water, which you inject into the exhaust stream of a diesel engine to help turn NOx, or …
ICYMI: EPA’s New Guidance Removes Requirement for Diesel ...
5 days ago · On Friday, March 27, 2026, President Trump announced U.S. EPA Administrator Lee Zeldin has issued new guidance making it clear DEF sensors are no longer required, and NOx …
DEF sensors no longer required on trucks, other diesel ...
Mar 29, 2026 · EPA changes its diesel exhaust fluid sensor policy. The post DEF sensors no longer required on trucks, other diesel equipment: EPA appeared first on FreightWaves.
EPA axes diesel exhaust fluid sensor requirements
Mar 30, 2026 · Dive Brief: The Environmental Protection Agency on March 27 rescinded a requirement that diesel equipment be equipped with diesel exhaust fluid (DEF) sensors, according to a press …
EPA Eases DEF Sensor Rules, But Keeps DEF Emission ...
6 days ago · EPA did not eliminate diesel exhaust fluid rules, which have been a problem for farmers and truck drivers because of failure rates, but issued new guidance last week, giving major …
EPA moves to end DEF-related engine derates | Commercial ...
Mar 27, 2026 · The EPA’s updated guidance, announced Friday, allows truck manufacturers to bypass sensors that monitor the quality of DEF.
EPA Eliminates DEF Sensor Requirement - ilma.org
6 days ago · The EPA issued guidance on March 27 eliminating the Diesel Exhaust Fluid (DEF) Urea Quality Sensor (UQS) requirement for on-road diesel vehicles and non-road equipment. The …