Dorman car parts enable you to replace just the part that failed without having to replace the entire assembly. Dorman auto parts are better than OE because they're designed to address the requirements of the repair. The Dorman EGR valve for certain Cummins diesel engines has been reengineered to include a redesigned position sensor axle bushing that eliminates the dislodging and erratic sensor readings that are common failure symptoms of the original unit.