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.

1999 Audi A8 BaseFACTORY OEM SERVICE PROCEDURE

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

Connect VAG 1551 Scan Tool, insert address word 08 "AC/Heating Electronics" and move forward in program until "Select function XX" is displayed. See VAG 1551 ((VAG 1552) SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS .
Switch printer on by pressing the PRINT button (indicator lamp in button comes on).

Indicated on display (function selection):

Fig 1: VAG 1551 Scan Tool - Checking Diagnostic Trouble Code Memory (1 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

Press buttons -0- and -2- (function "Check DTC Memory" is entered with 02).

Indicated on display

Fig 2: VAG 1551 Scan Tool - Checking Diagnostic Trouble Code Memory (2 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

Press -Q- button to confirm input.

Number of stored DTCs or "No DTC recognized" is displayed

Fig 3: VAG 1551 Scan Tool - Checking Diagnostic Trouble Code Memory (3 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

Press => button.

Stored DTCs are displayed and printed one after the other

If "No DTC recognized" is displayed, program returns to the starting position after --> button is pressed.

Fig 4: VAG 1551 Scan Tool - Checking Diagnostic Trouble Code Memory (4 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

Indicated on display (function selection):

Fig 5: VAG 1551 Scan Tool - Checking Diagnostic Trouble Code Memory (5 Of 5)

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Courtesy of AUDI OF AMERICA, INC.

End output (function 06). See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING (FUNCTION 05) .
Switch ignition off and unplug Data Link Connector (DLC).

Factory Service Tools

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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.

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