The problem has finally been found!
It was a miscalibrated wastegate valve that initially caused excessive soot, which became more apparent after the chip tuning. After replacing the turbo, there was no improvement. Only a diagnosis by a specialist eventually led to a solution.
Thanks again for all the answers!
Subject: Chip Tuning
Dear Mr. Kaufmann,
I would have liked to have the chip tuning done by you, but you did not respond to my inquiries, so I had to go to a competitor.
Best regards,
Translated on 05-09-2026, 7:27.
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