Exhaust System Components, Removing and Installing

Exhaust System Components, Removing and Installing

For all Exhaust System, Emission control component locations. Refer to Engine Mechanical Repair Information

For all Exhaust System, Emission control removal/installation procedures and torque specifications. Refer to Engine Mechanical Repair Information

Check the Technical Bulletins for information that may supersede any information included in this service information.

• All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi.

• Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool.

Three Way Catalytic Converter (TWC), checking

Test requirements

• Battery voltage at least 12.5 volts.

• Oxygen Sensors OK.

• No leaks or damage to exhaust system.

Function test

- Perform the function test in Diagnostic Mode 06. Refer to => [ Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions ] Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions.

- End diagnosis and switch the ignition off.

If the specified values are exceeded:

- Check the exhaust system for leaks.

- If necessary, repair the leak in the exhaust system.

- Erase the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

- Perform a road test to verify Repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End diagnosis.

If no leaks are found in the exhaust system:

- Replace the catalytic converter including front exhaust pipe.

Final procedures

After the Repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

End of Diagnosis