post the exact codes you're getting, please.
my sister passat is driving nuts i change every vacuum line there is and did a full timing belt and water pump service but still getting a check engine for brake booter mechancal failure and adv. timing someone help plz
my fake vag com took a crap on me but i remeber the two codes that cameup
brake booter vacuum mechanical failure
camshaft timing is adv.
i found out what it was on the intake look at vacuue booter line check value with a small nipple that was bad on mine