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 MANUALSAUDI1999A8 QUATTROREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 72 (ON BOARD DIAGNOSTIC (OBD) - RADIO, NAVIGATION, STEERING & TELEMATICS)MULTI-FUNCTION STEERING WHEEL, ON BOARD DIAGNOSTIC (OBD)DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING (FUNCTION 02)

1999 Audi A8 Quattro

Diagnostic Trouble Code (DTC) Memory, checking (function 02)

1999 Audi A8 QuattroSECTION Diagnostic Trouble Code (DTC) Memory, checking (function 02)

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NOTE: The displayed DTC information is updated only when initiating OBD or with "Erase DTC Memory" function 05.

Switch printer on via the PRINT button (indicator lamp in button lights up.)

Indicated on display

Fig 1: VAG1551 Scan Tool Display - Diagnostic Trouble Code Memory, Checking, Multi-Function Steering Wheel (1 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

Press buttons -0- and -2- to select "Check DTC memory", function 02.

Indicated on display

Fig 2: VAG1551 Scan Tool Display - Diagnostic Trouble Code Memory, Checking, Multi-Function Steering Wheel (2 Of 5)

G02719354

Courtesy of AUDI OF AMERICA, INC.

Press -Q- button to confirm input.

The number of stored malfunctions appears in the display.

Fig 3: VAG1551 Scan Tool Display - Diagnostic Trouble Code Memory, Checking, Multi-Function Steering Wheel (3 Of 5)

G02719355

Courtesy of AUDI OF AMERICA, INC.

The stored malfunctions are displayed and printed out one after the other.

Check print-out against DTC table and repair all malfunctions as necessary. See DIAGNOSTIC TROUBLE CODE (DTC) TABLE .

If "No DTC recognized!" is displayed, the program will return to "Select function XX" after the --> button is pressed.

Fig 4: VAG1551 Scan Tool Display - Diagnostic Trouble Code Memory, Checking, Multi-Function Steering Wheel (4 Of 5)

G02719356

Courtesy of AUDI OF AMERICA, INC.

Indicated on display

Fig 5: VAG1551 Scan Tool Display - Diagnostic Trouble Code Memory, Checking, Multi-Function Steering Wheel (5 Of 5)

G02719357

Courtesy of AUDI OF AMERICA, INC.

If something else is displayed:

See operating instructions of Scan Tool (ST).

End Output (function 06). See END OUTPUT (FUNCTION 06) .
Switch off ignition and disconnect diagnostic cables from Data Link Connector (DLC.)

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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.