Left front exhaust pipe with catalytic converter (vehicles with manual transmission), removing and installing

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Removing

NOTE:

All cable ties which are opened or cut open when removing, must be replaced in the same position when installing.

Fig 1: Removing Rear Engine Cover

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Remove rear engine cover - arrows -.

Fig 2: Removing Coolant Hoses At Coolant Expansion Tank

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Remove coolant expansion tank - arrow -.
Disconnect electrical connection from Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir and set aside coolant reservoir with coolant hoses - 1 - and - 2 - connected.

Fig 3: Disconnecting Electrical Harness Connector For Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131

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Disconnect electrical harness connector - 1 - for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 and free up wiring.

NOTE:

Ignore - 2 -.

Fig 4: Removing Nuts & Left Front Exhaust Pipe With Catalytic Converter

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

NOTE:

To improve clarity, the removed engine is shown from the rear.

Remove left front wheel.

NOTE:

Secure brake disc with a wheel bolt.

Fig 5: Locating Fasteners Exhaust Pipe

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For vehicles with auxiliary heater, remove bolts - arrows - for exhaust pipe of parking heater/auxiliary heater on noise insulation.

Fig 6: Identifying Quick-Release Fasteners And Noise Insulation

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Loosen quick-release fasteners - 1 through 3 - and remove front and rear noise insulation.

Fig 7: Removing Heat Shield For Left Drive Axle

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Remove heat shield - arrows - for left drive axle.

Fig 8: Removing Nuts & Left Front Exhaust Pipe With Catalytic Converter

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Remove nuts - 1 - and - 3 - which are accessible from bottom for front exhaust pipe/exhaust manifold.

NOTE:

To improve clarity, the removed engine is shown.

Fig 9: Removing Nut At Left Bracket For Front Exhaust Pipe

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Remove bolt - 1 - and nut - 2 -.
Remove bracket for front exhaust pipe.

Fig 10: Locating Clamping Sleeves

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Disconnect exhaust system at clamping sleeve - left arrow -.
Remove front exhaust pipe with catalytic converter.

Installing

Installation is in reverse order of removal, noting following:

NOTE:

Replace gaskets and self-locking nuts.
During installation, all cable ties must be re-installed at the same location.
Electrical wire of oxygen sensor must always be secured in the same position when installing so that contact with the exhaust pipe is avoided.

Align exhaust system free of tension → Exhaust system, installing free of tension .

NOTE:

Individual components of exhaust system mounting Individual left mounting components - vehicles with manual transmission

Torque specifications

		Nm
Front exhaust pipe with catalytic converter to exhaust manifold		27 ¹⁾²⁾
Mounting strap to	Front exhaust pipe	25
	Transmission	25
Heat shield for drive shaft to transmission		23
¹⁾ Replace nuts. ²⁾ Grease with hot bolt paste; hot bolt paste .