Add Yahoo as a preferred source to see more of our stories on Google. A VW sign is seen outside a Volkswagen dealership in London, Britain November 5, 2015. REUTERS/Suzanne Plunkett/File photo By Eric ...

FRANKFURT (Reuters) - Tens of millions of vehicles sold by Volkswagen AG over the past 20 years are vulnerable to theft because keyless entry systems can be hacked using cheap technical devices, ...