Could also be the flex section in the downpipe...which is where mine is coming from. No worries...perfect excuse to install a 2.5" SS DP from tdiparts.com
my issue was the downpipe, one of the 3 bolts that holds it to the manifold had a nut that was seized halfway on it, thus resulting in the downpipe flange not being properly clamped against the manifold. Found this when I was replacing the downpipe... unscrewed the whole bolt from the manifold and placed a thick washer in front of it.
now i can have the cabin fan running on startup and idle and not smell any fumes
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