DEF Warning in F350
While on a trip a message popped up "def range 400 miles." When I got home the next day the message was down to 200 miles. I added DEF but the message remains. I'm down to 100 miles and worried that...
Forum Discussion
dave17352 wrote:
Isi is complicated but the way I understand it is there is less soof so less regenerations which increases mileage
DEF is used to treat the exhaust to reduce the NOx emissions. DEF combines with the NOx in a chemical reaction to form nitrogen and water vapor. DEF equipped vehicles allow engineers to design and tune the engine with combustion efficiency a higher priority than vehicles using EGR as the main means of reducing NOx. Although both systems use EGR, the former system used a much higher level of EGR which had various negative effects on engine performance and reliability issues.
