Left combination valve for Secondary Air Injection, removing and installing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Audi S4, 2008 Audi S4, 2007 Audi S4, 2006 Audi S4, and 2005 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Identifying Hose Clamps 3094

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Hose clamps up to 25 mm diameter 3094

Removing

NOTE:

All cable ties opened or cut during engine removal must be reinstalled at the same locations during installation.

Fig 2: Removing Rear Engine Cover

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Remove rear engine cover - arrows -.

Fig 3: Removing Cover In Engine Compartment (Left Side)

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Remove cover - 1 - in engine compartment (left side).

Fig 4: Removing Coolant Hoses & Coolant Expansion Tank

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Clamp off coolant hose - 2 - using Hose clamps up to 25 mm diameter 3094 and disconnect from coolant expansion tank.
Seal connection using a plug that fits.
Remove coolant expansion tank - arrow -.
Disconnect electrical wire to Engine Coolant Level (ECL) Warning Switch F66 at bottom on expansion tank and set aside coolant expansion tank with coolant hose - 1 - connected.

Fig 5: Removing Bracket For Electrical Harness Connectors At Left From Bulkhead

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Remove electrical harness connectors - 1 to 4 - from bracket at left of bulkhead.
Remove bracket from bulkhead.

Fig 6: Disconnecting Brake Booster Vacuum Hose From Grommet On Bulkhead

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Disconnect vacuum line - arrow - to brake booster at bulkhead.

Fig 7: Disconnecting Electrical Harness Connector For Camshaft Position (CMP) Sensor 2 G163 On Left Cylinder Head

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Disconnect electrical harness connector - arrow - for Camshaft Position (CMP) Sensor 2 G163 on left cylinder head.

NOTE:

Illustration depicts engine from rear.

Fig 8: Disconnect Vacuum Hose, Electrical Harness Connector From Oil Pressure Switch F1, Removing Bolts & Oil Pressure Switch

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Disconnect vacuum hose - 3 -.
Remove bolts - 4 -.
Disconnect electrical harness connector from Oil Pressure Switch F1 - 5 -.
Remove oil pressure switch.

Remove bolts - 1 - and - 2 -.
Swing combination valve and remove bolts - 6 -.
Remove combination valve and connecting tube.

NOTE:

Illustration depicts engine from rear.

Installing

Installation is in reverse order of removal, note the following:

NOTE:

Always replace gaskets and seals.
Note installation position of seal between cylinder head and connecting tube.
Secure all hose connections using hose clamps appropriate for the model type .
During installation, all cable ties must be re-installed at the same location.

Check coolant level → Check coolant level .

Torque specifications

Component	Nm
Connecting tube to cylinder head	10
Connecting tubes to combination valve	10
Oil pressure switch to oil filter housing	25