I'm still trying to solve the hoot-hoot noise from the fuel filler area, so I asked about this issue on the PCA tech forum and someone answered that it was probably the valve housing in the front right fender: 996 201 231 01. I've already replaced the two valves in this housing to try to resolve the problem. I also replaced the regen valve under the engine intake and the valve on the fuel filler neck.
Since this component retails for around $500, I was wondering if there was any forum experience regarding this part before I open my wallet. Any idea what exactly could fail in the housing (rubber seal, etc.)? It looks like one of the two lines attached to it leads to the grommet opening in the fuel filler door, so my hunch is that the housing has failed in such a way that the associated valve is unable to properly seal off this line.
I've really been struggling to troubleshoot this issue. With no CEL, no refueling issues, no drivability concerns...seems I'm pretty much left to replacing parts.
My wife refers to the car as "our little locomotive...toot-toot!"
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