Erasing DTC memory: Requirements:

Indicated on display

Fig 1: VAG 1551/3 Scan Tool Display - Select Function XX

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Indicated on display

Fig 2: VAG 1551/3 Scan Tool Display - Erase DTC Memory

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Indicated on display

Fig 3: VAG 1551/3 Scan Tool Display - DTC Memory Erased

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Indicated on display

Fig 4: VAG 1551/3 Scan Tool Display - Select Function XX

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Fig 5: VAG 1551/3 Scan Tool Display - DTC Memory Not Interrogated

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If DTC Memory Not Interrogated appears in the display, the test sequence has not been performed correctly.
Keep exactly to the test sequence: First check DTC memory, then erase DTC memory in the same diagnostic cycle.