While our MY09 D4 SE was making easy work of pulling our 21foot Jayco out of the Abercrombie Gorge we experienced the delightful chimes and amber triangle confirming what I felt, loss of engine power. On opening the bonnet, luck led me to notice that the pipe connected to the RHS of the intercooler had slipped off. Quick attention to the jubilee clip removed the issue. Interestingly the computer logged a related issue with the Mass Air Flow indicator.