ok riight been starting trying to diagnos the fault codes on my audi s3 , one code i figured i could solve straight away , was maf signal too low , unplugged the maf to check if any differences no difference , just taught i'd check the forge dv and perform the leak test , and it failed piston slowly went down when my finger was over the vacuum nipple, which would indicate it's not holding boost so i'm guessing thats why i'm getting low maf readings ?