Comment by josefx

They are citing a blog post from the German magazine Auto Bild, which talks about the Auto Bild special "TÜV Report" edition. They are probably three or four layers of indirection removed from the original report produced by the TÜV itself.

I found a mention of the report on this page from the ADAC: https://www.adac.de/news/tuev-report-2026/

I think they mention suspension, brake and light related issues.