The EPA is escalating its response to consumer complaints regarding DEF system failures, announcing a new investigation aimed ...

The EPA questions if diesel DEF de-rates are essential for emissions compliance. Could changes be on the horizon? Discover ...

DEF is a key component in lowering pollutants emitted from diesel engines, helping to reduce harmful emissions. Long-haul truckers and diesel engine enthusiasts had to rethink their entire operations ...

The Trump administration is demanding warranty and failure data from top manufacturers in an effort to end truck engine ...

The U.S. Environmental Protection Agency is ramping up its pressure on engine makers to fix persistent persistent diesel ...

One of the many things we love about running a diesel engine is how long it will run. You can pack in a lot of mileage without needing major repair - as long as you take care of the motor and keep ...

EPA demands DEF failure data from diesel makers. Investigation could force recalls and software fixes for engines already on U.S. roads. 30-day deadline set.

The EPA is considering eliminating the "limp mode" rule for diesel engines, a feature that drastically slows trucks and ...

The federal agency is demanding failure and repair data from manufacturers to "hold [them] accountable for the continued system failures." ...

PACCAR has patented a method to evaluate Diesel Exhaust Fluid (DEF) quality in emissions aftertreatment systems. By analyzing NOx conversion efficiency in SCR units, the system adjusts DEF dosing to ...

Under today's guidance, EPA says farmers can temporarily override emissions systems to make repairs, as long as the equipment ...

EPA asked manufacturers for info in hopes to "PERMANENTLY eliminate the deratements ENTIRELY," agency boss Lee Zeldin said.