Volkswagen's cheating engines can't be easily fixed (vw)

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REUTERS/Fabian Bimmer

Volkswagen is confronted with a monumental challenge.

The company has admitted that 11 million of its cars used illegal software to cheat emissions standards. 

Now, many owners are demanding that the offending cars be fixed.

That's easier said than done, and Volkswagen's already tried – and failed – twice.

Here's the issue, according to the Environmental Protection Agency: cars with Volkswagen's 2.0 liter TDI turbo-diesel, four-cylinder engines include software that detects when the car is undergoing emissions testing and turns on a suite of pollution control systems. 

But as soon as the test ends the controls switch off, leaving the engine free to emit up to 40-times the legal limit of Nitrogen Oxide – a highly polluting gas. According to the California Air Resources Board, or CARB, Volkswagen admitted to using a defeat device during a September 3, 2015 meeting with the agency and the EPA.

The problem for Volkswagen is that getting the engine's emissions in line with pollution standards probably means sacrificing something else.

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