Came across a new-to-me vacuum leak fault this morning that looks likely to be a common one on the 6-valve 3-cylinder engines as these cars get older. It was on a 9N3 2005 Polo, but same engine code is in plenty of Mk1 Fabias.  The AWY engine code that preceeded this one is probably similarly vulnerable.   Owner was asked "are there any fault lights on" and I was told "Oh yes, been on quite a while" So VCDS Lite was plugged in and revealed  3 Faults Found: 16555 -  Fuel Tri