Audi Q7: Maintenance and Care

 Vacuum System

Connection Diagram - Vacuum System   Caution There is a risk that an engine malfunction may occur. When routing the vacuum lines, make sure they are not kinked, twisted or pinched.   Note Dark gray - vacuum supply line Red = control line to the intake manifold runner control vacuu

 Oxygen Sensor 1 After Catalytic Converter - GX7-, Checking

General Description The Oxygen Sensor 1 After Catalytic Converter -GX7- is positioned downstream of the primary catalytic converter and it supplies the Engine Control Module -J623- with a voltage signal (nonlinear) indicating a "rich" or a "lean" condition is present. If the primary catalytic co