Not sure which one you are talking about but this link will show you all of them: http://www.audi.co.uk/etc/medialib/cms4imp/audi2/uk/Products/owners_area/Choose_Model.Par.0011.File.pdf
If it is red, it is very important. all other colors are caution(yello) and green(just letting you know) . If I had to guess I would say it has something to do with you breaks. I would also need to know the year of the A3.
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