Three Way Catalytic Converter, Checking

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.

Test requirements

Battery voltage at least 12.5 volts.
Oxygen Sensors OK.
No leaks or damage to exhaust system.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to → Preliminary Check

Function test

Perform the function test in Diagnostic Mode 06. Refer to → Diagnostic Mode 06: Checking test results of components that are not continuously monitored .
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 04 - Reset/Delete Diagnostic Data .
Perform a road test to verify Repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to → Readiness Code Description .

End diagnosis.

If no leaks are found in the exhaust system:

Replace the catalytic converter including front exhaust pipe. Refer to 26 EXHAUST SYSTEM, EMISSION CONTROLS .

Final procedures

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

Check the DTC memory.
If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
If the DTC memory was erased, generate readiness code. Refer to Readiness Code Description .

End of diagnosis.