diavlo1984

There is a recurring theme I am finding. As a fellow Subaru Diesel owner with the P0409 problem on engine start, having already replaced the EGR valve, what is going on? Someone must know how to fix this as its not going to pass its MOT as you can clear the code, and then it comes back. I do get a hissing sound, but we've checked everything is tight and can't find any leak on intake. Could it be the exhaust cooler leaking, could that cause a P0409?

Same, replaced, still get P0409 code and a hissing sound whilst driving. Could the EGR cooler be leaking?