2009 407 hdi lack of low down power and depollution faulty

[11esprit]

My 2009 407 hdi is lacking low down power and also showing depollution faulty message. I have plugged in scanner and it is coming back with codes P2562 and P2084 but not sure what this can be. I have unplugged maf and has not made much difference and also the same with the egr. I am not sure what it can be or how I go about diagnosing without replacing lots of sensors?

[11esprit]

It's the 2.0 hdi. I do mainly motorway driving around 600 miles per week so the dpf should be regenerating.