Checking exhaust flaps: Audi A8 D3 6.0 (BHT, BSB, BTE)

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

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

🔧 Engine codes this applies to

📋 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. Select Vehicle Self-Diagnosis and vehicle system "“01 - Engine electronics”".
4. From the menu (1) select the diagnostic function "“03 - Final control diagnosis”".
5. Press → key repeatedly until exhaust flap valve N321 is activated.

6. Press ← key to exit "“03 - Final control diagnosis”" function.
7. Press "“06 - End output”".
8. Select vehicle system "“11 - Engine electronics II”".
9. From the menu (1) select the diagnostic function "“03 - Final control diagnosis”".
10. Press → key repeatedly until exhaust flap valve 2N322 is activated.
11. Press ← key to exit "“03 - Final control diagnosis”" function.
12. Press "“06 - End output”".
13. Switch off ignition.
14. Check vacuum unit of exhaust flap .
15. Check vacuum line leading from vacuum reservoir to corresponding exhaust flap valve (rear) on underbody.
16. Check exhaust flap valve N321 and N322 in "“Guided Fault Finding”".

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