The Fast Lane Car attempts to trick a 2011 Volkswagen Jetta TDI into its emissions defeat mode over two dyno runs. It isn't clear cheat mode is actually active, but a power drop is detected from one run to the next.
Diesel models of the Chevrolet Colorado and GMC Canyon are the first to get extra scrutiny by the EPA and CARB, but they're expected to pass. The added testing shouldn't effect when they hit dealers, either.
VW CEO Martin Winterkorn has issued a statement regarding EPA and CARB allegations that cars with its 2.0-liter TDI engine don't meet US emissions requirements. The automaker promises an external investigation.