Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | 4-Cylinder engine (2-valve), Mechanics | Exhaust system | Secondary air system - vehicles with engine code letters ANA | Principle and function | Secondary air system

Secondary air system - exploded view of components

1 -	Secondary air pump motor -V101-

q	Fitting location → Fig.

2 -	Air cleaner

3 -	Combination valve for secondary air

q	Fitting location → Fig.

q	Removing and installing → Chapter

4 -	Throttle valve module -J338-

5 -	Secondary air pump relay -J299-

q	Fitting location → Fig.

6 -	Simos control unit -J361-

q	Fitting location → Fig.

7 -	Non-return valve

q	Installation position: as shown in illustration, the arrow points in direction of flow

8 -	Secondary air inlet valve -N112-

q	Fitting location → Fig.

9 -	Intake manifold

10 -	Cylinder head

Fitting location of secondary air inlet valve -N112-

t	Fitting location: At rear left of intake manifold, below coolant expansion tank -arrow-.

Fitting location of secondary air pump motor -V101-

t	At front right of engine compartment, below longitudinal member.

Fitting location of secondary air pump relay -J299-

t	In electronics box (plenum chamber).

1 -	Simos control unit -J361-

2 -	Secondary air pump relay -J299-

3 -	Current supply relay for Simos control unit -J363-

Fitting location of combination valve for secondary air

t	At rear right of cylinder head, below intake hose -arrow-.

Audi Workshop Service and Repair Manuals