Volkswagen faces fresh emission claims in US
Volkswagen cars with bigger diesel engines also contained devices designed to cheat in emissions tests, according to US regulators.
Porsche, Audi and VW cars are all included in a new investigation which affects at least 10,000 vehicles.
However, VW denies the vehicles have software designed to cheat tests. Porsche said it was "surprised" by the allegations.
Gary O'Donoghue reports.
