Why can't the name of the auto repair company be written on the plaque of the auto repair shop?

The name of the auto repair company cannot be written on the plaque of the auto repair shop because there is no authorization. Without the authorization of the trademark licensor, it is infringing in most cases. Only when your business name or business entity already contains the word "Audi", and then your store name or company name is printed on the signboard, you will not infringe.