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

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

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• 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.