Just like SteveS, I've got an 07 Ed30.
Am I still needing the N version Part that Thor suggested 06F 129 101 N, which does not require the new hose with the additional check valve?
I might make the trip to the dealers tmrw. Thing is I've got not problems at all with idling etc.
Is it advisable to change now to prevent any future problems?
Or is it a case of "if it ain't broke don't fix it"?
....I think I know the answer really