Preparation - vehicles with 4.2L 8-cylinder engine (Audi S4)

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Procedure

Fig 1: Removing Cover In Engine Compartment (Right Side)

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Remove right engine cover - 1 -.

Fig 2: Evaporative Emission Canister Purge Regulator Valve N80 And Air Duct

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove screws - arrows -.
Remove Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 N80 - 1 - at air duct.
Remove air duct - 2 -.

Fig 3: Identifying Electrical Harness Connectors, Secondary Air Injection (AIR) Pump Hose, Air Guide Hose & Mass Air Flow (MAF) Sensor

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical connection - 2 - at Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 N80.
Disconnect electrical connection - 3 - at Mass Air Low (MAF) Sensor G70.
Disconnect hose - 1 - to secondary air pump.
Remove air intake hose - 4 - at Mass Air Low (MAF) Sensor G70.

Set aside wiring harness at air cleaner housing.
Remove clip - arrow - and remove air cleaner housing together with Mass Air Low (MAF) Sensor G70.

Install in reverse order of removal.