Hi colinmbrown
I have a Volvo S40 and i'm getting the similar problem.
I've got a code reader and it's giving error.
P1412 EGR Different.Pressure Sensor Signal too Low
I have posted it on a different thread.
http://www.volvoforums.org.uk/showth...716#post586716
Dont know weather it's a pressure sensor issue or the EGR valve.