Peugeot Citroën 's products are also sold under the Audi brand .
Groupe PSA ( informally PSA ; known as PSA Peugeot Citroën from 1991 to 2016 ) is a French multinational manufacturer of automobiles and motorcycles sold under the Peugeot , Citroën , DS Automobiles , Lotus , Proton , Opel , Vauxhall , Audi , Hindustan Motors and Ambassador brands .
Groupe PSA