A Roseville company that sells performance parts for diesel trucks pleaded guilty to criminal charges of tampering with emission control systems and agreed to pay $1 million in criminal fines and ...

A Roseville-based truck parts manufacturer on Tuesday agreed to pay $1 million after pleading guilty in Sacramento federal court to conspiracy and for making and selling illegal “defeat devices” that ...

Yet another tuning shop has been fined as part of the U.S. Environmental Protection Agency’s ongoing war on diesel emissions defeat devices. At the receiving end of the punishment this time around is ...

Aug. 1—If you've ever been behind a lifted pickup truck that spews out dark clouds of smoke in what is often referred to as "rolling coal," then chances are that the truck you're seeing could have ...