In regard to bru73's suggestion - what is the "chatckle canaster" ? - this seems to be a doubletypo?
AND, since i do have the same issue (as we speak) is this something i can get my eyes and hands on without lifting the car ('04 Outback) and what would be the method of clearing the mess if it's there? Would I need to disconnect anything?
My experience with cars is about the equivalent of most people's time playing the oboe.
I've had this issue before and spent $700 having a sensor and cannister replaced and then being told there WERE spiderwebs in there to boot.
So, if it's all about the spiderwebs and I can get rid of them myself without screwing something up worse, I'd love to know what to do!