VW’s ability to push through its plans to make big spending cuts to pay for the emissions scandal was challenged by its works council, signaling an internal battle is looming at a company already assailed by regulators, investors and customers. The crisis, which erupted in September when Volkswagen admitted it had rigged U.S. tests for nitrogen oxide emissions, deepened this week when it said it had also understated the carbon dioxide emissions and fuel consumption of vehicles in Europe.