I had quite a strong smell in the car too... ended up calling out VW roadside assistance in the end. The gent was very helpful and a former VW engineer, but could find no fault codes.
So dont expect to VW to do too much about it... all logic goes out of the window unless its a fault code.
I found the smell to be strongest near the front of the engine bay on the passenger side, which happens to be the opposite side to the fuel lines etc.

:embarassed:
On the bright side it didnt happen again