Hi everyone , long story short but had car put on Peugeot planet last week as engine light on and anti pollution fault , came back with permanent egr fault p0400 so over weekend I tackled the dreaded task of replacing as mine is the 110 307 hdi at back of engine , after 2 solid days it's all back together with brand new pie burg egr valve , after I fitted and got running I see lights still on ... So cleared all faults using my personal scanner , go out today on good 100 mile drive and bam it's back again !! No limp home mode thank god but got home gave a scan and the same code has reappeared p0400 , I didn't see much difference when changed to be honest but thought better change to get rid of fault... Can anyone help me why this is back again !! also since of had car for last few weeks it seems not perfect with boosting , sometimes it feel a bit restricted through rev range .. Don't know if helps ?