Originally Posted by offenaudi

i have an 98 a6,anytime i start her up i hear this hissing sound coming from the passenger front,even when i shut it down i can still hear it from inside for about a minute until it goes away,can someone help me?

Hey Offen

Do you have a CEL on? (Engine light). If so, get that read at you local Autozone or similar place. Then take the codes and enter them here: PlanetVAG.com - VAG Diagnostic Trouble Code (DTC) or OBDII Code Search

Hope that helps.

Cheers
Massboykie