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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSEVAP SYSTEM, CHECKING
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
EVAP System, Checking
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION EVAP System, Checking
Evaporative Emissions (EVAP) System, Checking
Function, checking
- Connect VAG1551 or VAG1552 Scan Tool (ST), and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle). [1][2]Scan Tool Connecting and Initial Checks
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Press buttons -0-, -1- and -2- to input display group number 12 (012), and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 12 ->
1 2 3 4
- Check specified values for function of EVAP system at idle (display fields 1-4):
Check display field 4:
"EVAP active" = EVAP system operational
"EVAP inact." = engine cold
"lamda-Adaptation" = no EVAP system operation, oxygen sensor control learning
Check display field 2:
-5% = EVAP system leaking, or no fuel vapors in EVAP canister
95% = EVAP canister saturated
100% = EVAP system blocked
- Press -> button to advance program sequence.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
RENDER: 1.0x
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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.