In the US, VW group has a 4.1% market share down from 4.3% last year:

https://www.google.com/amp/s/amp.cnn.com/cnn/2023/11/27/busi...

In Europe VW has a 9.8% market share down almost 2% from the previous year: https://www.goodcarbadcar.net/volkswagen-europe-sales-figure....

This is relevant because it shows that VW is loosing significant market share in US and Europe. It's loosing about 20% market share per year (2% off 10%). This is after dieselgate. One could infer that dieselgate caused consumers to no longer trust VW, along with other systemic problems within the company and its products, could be a cause of this downturn in market share.