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HOMESERVICE MANUALSAUDI2007A3 BASE, AUTOMATIC DCTREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (3.2L - GENERIC SCAN TOOL - ENGINE CODE(S): BUB)ST GENERIC SCAN TOOLDESCRIPTION AND OPERATIONEVAP SYSTEMEVAP SYSTEM, CHECKING FOR LEAKS
2007 Audi A3 Base, Automatic DCT

EVAP System, Checking For Leaks

2007 Audi A3 Base, Automatic DCTSECTION EVAP System, Checking For Leaks
WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required 

  • Smoke tester.
  • EVAP and Fuel Supply System Vacuum hose and line routing diagram.
NOTE:

Replace seals and gaskets when performing repair work.

Leak checking

-- Using a Smoke tester, check the Evaporative Emission (EVAP) canister system for leaks.

NOTE:

Always follow the manufacturers directions for the proper installation and operation of the Smoke tester being used.

If a leak is detected:

-- Check the fuel filler cap seal for damage and for proper installation. Replace if necessary.

-- Check the seals under the locking flanges and the union nuts are properly tightened on the fuel tank.

-- Check all hose connections of the fuel supply system and replace or repair any leaking lines.

-- Check all hose connections of the EVAP system and replace or repair any leaking lines.

-- Repair or replace any damaged component.

If no leaks are found in the EVAP and Fuel Supply System:

-- Erase the DTC memory if a DTC was set. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If a DTC was set and does not return:

Repair complete, Generate readiness code. Refer to READINESS CODE DESCRIPTION .

-- End diagnosis.

If the DTC does return and no leaks are found in the EVAP and Fuel Supply System:

-- Check the DTC memory for any DTC codes pertaining to the EVAP and Fuel Supply Systems. If a DTC is stored, perform the diagnostic test procedure for the suspected component. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .

End 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.