While diesel-powered passenger vehicles are increasingly limited in the U.S., they remain vital, especially for those in the ...

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

The feds aren't scrapping DEF altogether, but this could potentially address a large portion of emissions system failures.

EPA’s latest move on diesel exhaust fluid systems aims to reduce unexpected derates and costly downtime, both persistent ...

Sick of DEF failures shutting you down? EPA is pushing changes that could reduce disruptions caused by faulty sensors.