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.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEVAPORATIVE EMISSIONS SYSTEMTESTING AND INSPECTIONEVAP SYSTEM, AUTOMATIC LEAK TESTING
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
EVAP System, Automatic Leak Testing
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION EVAP System, Automatic Leak Testing
The ECM performs at certain intervals a tank leak test with the engine running, e.g. shortly after the engine is started.
A leak test can be evaluated using the VAS5051 or the VAG1551 scan tool, using the "Read Measuring Value Block" function, EVAP System, Leak Testing Using VAS5051 or VAG1551
If the system is OK:
- This is displayed in display group 071
Read Measuring Value Block 71 ->
Reed open Check. END Syst.OK
If the automatic tank leak test was aborted due to incorrect test results:
- This is displayed in display group 071
Read Measuring Value Block 71 ->
Reed closed Abort Test OFF
If the system is not OK:
System in Basic Setting 71 ->
Reed cl Lg. Leak END Syst.n.OK
- "Syst.n.OK" appears in display group 071 (example).
- In addition, a DTC will be stored in DTC memory (example):
16839 P0455 035 ->
Large leak recognized
NOTE: The tank leak test with the Vehicle Diagnostic, Testing and Information System VAS5051 or VAG1551 will not be hindered by the automatic tank leak test.
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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.