Hi guys, I hope you don't mind me posting here as i don't have a megane but an X-trail with the same engine so am hoping that the knowledge might be the same. Engine is M9R 2.0 DCI 173. It was remapped but had an EGR fault, EGR was replaced but didn't realise it needs position learning so left it. The DPF failed so i replaced the full exhaust and whilst having the ECU reset for the DPF i asked them to relearn the EGR but the fault persists with P0409. I was going to get the EGR mapped out (it's blanked off now) but the remapper wanted the car stock and so hopefully that's been done but what i also noticed is another problem and am not sure if it's map or could be EGR having an effect. Mostly noticed under full throttle, the turbo just drops out from full pressure 22psi to between 8 and 14psi then slowly builds back up not the normal spool up and not very fast for the RPM so definitely being controlled by the ECU. This is just what i want to know really is if a fault with the EGR is present would the ECU respond by dropping the turbo pressure through the RPM and by remapping and also egr delete work. I've currently got it booked in to Nissan for them to do a software update on the ECU to make sure the ECU is running the default map and not any settings left over by the old map. I've also replaced the turbo, maf, map, boost solenoid and as said EGR, so these should be all good. If anyone can shine any light i'd appreciate it as currently the x-trail forums are not allowing signups so couldn't ask there.