Checking function of exhaust flap: Audi A6 C5 3.0 (ASN, AVK, BBJ, CFSA)

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Special tools named: VAS 5051/1

Don't miss

• Run engine briefly to ensure the vacuum necessary for testing is present in vacuum reservoir.

🔧 Engine codes this applies to

📐 20 workshop diagrams for ASN

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Run engine briefly to ensure the vacuum necessary for testing is present in vacuum reservoir.
2. Switch engine off and ignition on.
3. Connect up vehicle diagnostic, testing and information systemVAS 5051B with diagnosis lead VAS 5051/1, press Vehicle self-diagnosis key and select vehicle system "“01 - Engine electronics”".
4. From the menu (1) select the diagnostic function "“03 - Final control diagnosis”".
5. Press the → key repeatedly until the following display appears:

6. Check vacuum unit of exhaust flap
7. Check vacuum line from vacuum reservoir in front left wheel housing to exhaust flap 1 valve N321 below luggage compartment side trim (left-side).
8. Check exhaust flap 1 valve N321
9. Press the ← key to exit from function "“03 - Final control diagnosis”".
10. Press function "“06 - End output”".
11. Switch off ignition and unplug diagnostic connector.

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