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.
Diagnostic Trouble Code (DTC) memory, checking: Notes
- Connect VAG 1551 Scan Tool (ST) with VAG 1551/3 adapter harness.
- Start engine and let idle.
Operate VAG 1551 Scan Tool (ST) according to information and instructions on the display:
- Press button -1- for Rapid data transfer operating mode.
- Press buttons -0- and -1- to enter address word 01 for Engine Electronics.
If engine does not start:
- Operate the starter for approx. six seconds (then DO NOT switch the ignition OFF).
- Press PRINT button to switch the printer on (indicator lamp in button lights up).
Indicated on display
- Press buttons -0- and -2- to select the "Check DTC Memory" function.
- Press -Q- button to confirm input.
The number of stored Diagnostic Trouble Codes (DTCs) will be indicated
or
"No DTC recognized" will be displayed.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.