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 MANUALSVOLKSWAGEN1999GTI (1W1) V6-2.8L (AAA)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESDIAGNOSIS WITH VW SCAN TOOL, ADDRESS WORD 01CHECK DTC MEMORY (FUNCTION 02)
1999 Volkswagen GTI (1W1) V6-2.8L (AAA)
Check DTC Memory (Function 02)
1999 Volkswagen GTI (1W1) V6-2.8L (AAA)SECTION Check DTC Memory (Function 02)
Special tools, testers and auxiliary items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable.
Work sequence:
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01 Connecting and Selecting "Engine Electronics" address word 01. When doing this the engine must be running at idle speed.
NOTE: If engine does not start, operate starter for approx. 6 seconds and then do not switch ignition off.
- Switch printer on with PRINT button (warning lamp in button lights up).

Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02 and press -Q- button to confirm input.

The number of malfunctions stored or "No DTC recognized" will be shown on the display.
NOTE:
If something different is indicated on the display: See VAG 1551 scan tool operating instructions.
If one or more malfunctions are stored, the malfunctions stored will be displayed and printed out one after the other.
- Locate and eliminate malfunctions printed out as per Diagnostic Trouble Code (DTC) table. Diagnostic Trouble Code Descriptions
NOTE: If no malfunction is stored:
- Press -> button.

Indicated on display
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Erasing DTC memory. Erase DTC Memory (Function 05)
NOTE: If a malfunction is present which is not recognized by On Board Diagnostic (OBD), perform further diagnosis using "Electrical Wiring Diagrams".
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable.
Work sequence:
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01 Connecting and Selecting "Engine Electronics" address word 01. When doing this the engine must be running at idle speed.
NOTE: If engine does not start, operate starter for approx. 6 seconds and then do not switch ignition off.
- Switch printer on with PRINT button (warning lamp in button lights up).
Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02 and press -Q- button to confirm input.
The number of malfunctions stored or "No DTC recognized" will be shown on the display.
NOTE:
If something different is indicated on the display: See VAG 1551 scan tool operating instructions.
If one or more malfunctions are stored, the malfunctions stored will be displayed and printed out one after the other.
- Locate and eliminate malfunctions printed out as per Diagnostic Trouble Code (DTC) table. Diagnostic Trouble Code Descriptions
NOTE: If no malfunction is stored:
- Press -> button.
Indicated on display
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Erasing DTC memory. Erase DTC Memory (Function 05)
NOTE: If a malfunction is present which is not recognized by On Board Diagnostic (OBD), perform further diagnosis using "Electrical Wiring Diagrams".
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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.