Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Function test
2009 Audi A6 BaseSECTION Function test
WARNING: This page is about a different variant/trim than selected.
NOTE:
- If the accelerator pedal is depressed during the test, the test will be aborted.
- Connect the scan tool.
- Start the engine and run at idle for at least 15 minutes.
- Select "Diagnostic Mode 08 - Tank Leak Test".
- Select " Tank Leak Test".
- Check the specified value of the tank leak test at idle.
- The following may be displayed on the scan tool screen:
| Tank leak test | Specified value | |||||
|---|---|---|---|---|---|---|
|
Test OK | |||||
- Switch the ignition off.
If the specified result is obtained:
System OK.
If the specified result is not obtained:
- Repeat the tank leak test, switch the ignition off and start the engine again and let run for 15 minutes at idle.
- Switch the ignition off.
If the specified result is again not obtained:
- A leak may be present. Refer to → EVAP System, Leak Detection .
End of diagnosis.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.