Hi I have a 2010 Subaru outback 2.0 and I am also suffering from error P0409. I changed the egr for a compatible one, specifically for this one: https://www.ebay.es/itm/324030019509 After changing the error persists after the third boot. How did you solve it? Have you had to put the original Subaru egr? The problem is something else and I don't thank you very much.