Car was bought in 2010 74K and in fall changed right cat after code P2096 came on. Spring of 2011, changed left side after cat code P2098. Replaced cats and install 4 new o/e sensors. P 2098 keeps coming on. VW dealership are stumped and local VW mechanics says vacuum leak but cannot locate? MIL comes on 71 miles, then 425 miles, then 120 miles. Need intelligent answer, I love this car!!!!!!!