Egr replacement

[Colin.dexter]

Hi all,

Got a 2014 d40, eml came on for egr so has been replaced. However eml came on again after clearing faults with PO409? What could be the fault? Wiring or something more sinister 

[Trevor]

there are some posts on google search relating to the PO409 code

I would first start by running some cleaning solution through the fuel and give the engine a very long high revs run to burn off any excess carbon that has collected in the EGR or Intake Manifold