Since mechanically they are a little ignorant, I ask you this. The machine turn on the mil because of dtc DF209 and DF647 (attached the screen) . Since I have difficulties to find the right method to delete from the map management the egr, if I make the switch off of these 2 dtc, according to you I solve the problem? In the sense that if I turn off the light on the dashboard, and mechanically I leave the valve as is what happens? Thanks