The Verge:
The presentation was reportedly prepared in response to Volkswagen's realization that it couldn't meet the US's more stringent diesel emissions standards without wearing out filtering equipment too quickly. In lieu of fitting better, cleaner systems that would've increased sticker prices, the presentation showed how VW could use embedded software to detect when an emissions test was underway and change engine parameters in response, making the cars appear cleaner than they actually were.
Repulsive and disgusting.