Hi folks, Have just bought myself a 2000 vintage, 1.8t quattro A3. Its in pretty good order but the guy I bought it from told me the Longditudenal motion sensor needs replacing. Apparently it affects the ABS!. Does anyone know how big a job it is to sort this out?? How many of my hard earned pounds will I have to part with?? and where should I buy said item from?? Heres hoping someone can sort me out.