Understanding The 'Test Mode' That Let VW Trick The Emissions Test

#hashtags: #Volkswagen #EPA #Reports

Volkswagen faces a maximum fine of $18 billion for having diesels that are much dirtier in real world driving than during the EPA’s mandated tests. But how does a car know it is being tested? Consumer Reports explains that the method is simple and uses a feature common in modern cars — but VW is in hot water over how they exploited it.