Right front exhaust pipe with catalytic converter, removing and installing (vehicles with manual transmission): Removing

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Removing Rear Engine Cover

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Remove rear engine cover (arrows).

Fig 2: Removing Cover In Engine Compartment (Right Side)

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

Fig 3: Evaporative Emission Canister Purge Regulator Valve N80 And Air Duct

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Remove bolts (arrows).
Detach Evaporative Emission (EVAP) canister purge regulator valve -N80- -1- at air guide.
Remove air guide -2-.

Fig 4: Removing Air Filter Housing

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Remove air filter housing (arrows).

Fig 5: Identifying Holding Plate, Intake Air Hose, Hose & Air Duct

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Remove bolts for holding plate -3- for solenoid valves (arrows).
Disconnect electrical harness connector at Mass Air Flow (MAF) sensor.
Remove hose -4- from air duct -2-.

Fig 6: Removing Bolt And Disconnect Air Duct At Throttle Valve Control Module

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Remove bolt (arrow) and disconnect air duct -2- at throttle valve control module.
Disconnect hose -1- from air duct.

NOTE: Illustration shows the air guide from rear with the engine removed.

Fig 7: Removing Harness Connectors From Bracket At Right Of Bulkhead

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Remove harness connectors -1 to 4- from bracket at right of bulkhead.
Disconnect electrical harness connectors -1- and -4-.
Guide wires to oxygen sensors downward.

Fig 8: Removing Nut For Right Exhaust Pipe/Exhaust Manifold

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Remove nut -2- for exhaust pipe/exhaust manifold which is accessible from top.

NOTE: Illustration is shown with engine removed.

Remove right front wheel

Fig 9: Identifying Exhaust Pipe Fasteners

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For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of auxiliary heater on sound insulation.

Fig 10: Identifying Quick-Release Fasteners And Noise Insulation

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Remove bolts or release quick-release screws -1- and -2- and remove front sound insulation.
Remove quick-release screws -3- and remove rear sound insulation, if present.

Fig 11: Removing Bolts For Front Vehicle Floor Crossmember