Only reason I ask is on the D3 I (and others) have run an ABS test or something and once done a code is stored, which only seems to relate to the test having been run, and isn’t erasable.
I’ve no knowledge of your issue, it just made me think it could be similar.
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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