TDI Problems: A Troubleshooting Guide

The recurring questions about "typical" TDI problems and the answers in the forum, often without referencing existing technical articles or similar resources (or only referring to the search function, which now produces a massive amount of results depending on the query, making it a time-consuming task to sift through), suggest that there is still a need for a kind of basic guide that provides common solutions for common problems.

Therefore, I created a collection, essentially a concise, updated, and somewhat more comprehensive compilation of Rainer's individual entries in the now enormous TDI error database.
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Corrections and suggestions for additions (especially for PD engines!) are, as always, welcome.
If they are organized into a structured format (symptoms, causes, tests, solutions), that is even better .

"However, in my opinion, extremely rare or unusual cases should be excluded, so that the story remains relatively clear and doesn't get lost in a maze of highly complex possibilities."
That's what the forum is for, after all...