The head of VW cars in the UK has apologised "unreservedly" for "significantly" letting down its customers in the diesel emissions scandal.
It comes days after the American boss of VW made a 'sincere apology' over the scandal which has affected more than 11 million cars worldwide.
Switzerland has banned the sale of some Volkswagen (VW) diesel-engine models temporarily in the wake of the emissions scandal.
It follows revelations that 11 million vehicles worldwide had been fitted with software to cheat emissions tests.
The move could potentially affect 180,000 cars in the Euro5 emission category that have not yet been sold or registered. It includes all VW models as well as Seat, Skoda and others in the VW group.
Porsche sports car chief Matthias Mueller has been named as the new chief executive of the group after Martin Winterkorn resigned.
Volvo withdrew an app comparing cars' emissions in 2011, after being told by that the data "could not be taken seriously".
Volkswagen's US boss has admitted he was told in spring last year of the emissions cheating affecting millions of the company's vehicles.
Volkswagen could start recalling cars containing emissions cheating software in January, according to the firm's new chief executive.