Hi MOJO we've done 2 of these blocked pressure sensor pipes now,no parts involved,so if you can fiddle a bit yourself its a freebee! As Bmx said its abit of a pain to see but we found it easier to remove the front wipers and wiper scuttle etc,then take off air filetr and pipes,throttle body and egr valve,then you should see the small diameter metal pipe,we used a piece of bowden cable in a drill and just worked in and out to clear the carboned up blockage.(you do have to remove the pipe to do this bit)regards,Peter