VW says fuel usage understated on some models; Porsche warns

Germany's Volkswagen on Tuesday said it had understated the fuel consumption of 800,000 cars sold in Europe, while majority stakeholder Porsche Automobil Holding warned that VW's latest findings could further weigh on its results.

The latest revelation about fuel economy and carbon dioxide emissions, which Germany's largest automaker said represented a roughly 2 billion euro ($2.19 billion) economic risk, deepened the crisis at VW.

The scandal initially centered on software on up to 11 million diesel vehicles worldwide that VW admitted vastly understated their actual emissions of smog-causing pollutant nitrogen oxide.

U.S. environmental regulators said on Monday that similar "defeat devices" were installed on larger 3.0 liter engines used in luxury sport utility vehicles from Porsche and Audi, although VW has denied those allegations.

Porsche's North American unit said it was discontinuing sales of Porsche Cayenne diesel sport utility vehicles until further notice, citing the allegations.

The latest findings that VW understated fuel consumption and carbon dioxide emissions, areas which U.S. regulators have yet to address, were disclosed as VW continues a broad review of its handling of all pollution-related issues. While the findings mostly apply to smaller diesel engines, one gasoline-powered engine is also affected.

"VW is leaving us all speechless," said Arndt Ellinghorst of banking advisory firm Evercore ISI. "It seems to us that this is another issue triggered by VW's internal investigation and potentially related to Europe."

The carmaker said it would immediately start talking to "responsible authorities" about what to do about the latest findings.

"From the very start I have pushed hard for the relentless and comprehensive clarification of events," Volkswagen Chief Executive Matthias Mueller said in a statement. "We will stop at nothing and nobody. This is a painful process but it is our only alternative."

'Deeply concerned'

Porsche, which last month had already cut its outlook as a result of the scandal, said it was sticking with its current forecast for post-tax profit of between 0.8 and 1.8 billion euros. But it said the forecast could still change and was dependent on VW meeting its own current profit forecasts.

The biggest business crisis in VW's 78-year history has wiped as much as a third off its stock market value, forced out long-time CEO Martin Winterkorn and rocked the auto industry, a key employer and source of export income in Germany.

"Volkswagen has done a disservice to German industry," Ulrich Grillo, the head of the Federation of German industries, told a conference on Tuesday, adding the firm had an obligation to the whole industry to clear up the scandal quickly.

German Chancellor Angela Merkel and the European Commission, the European Union's executive body, called for clarity and transparency to clean up the scandal.

VW's supervisory board said it is "deeply concerned by the discovery of the irregularities" involving CO2 levels, and will meet in the "very near future" on the issue.

In the United States, Mary Nichols, chair of the California Air Resources Board, which tested Volkswagen's diesel engines, told Reuters on Tuesday that the regulator will likely investigate the company's gas engines in California in wake of discovering the irregularities out of Europe.

"The issue is the CO2 from all their fleet, not just from diesel vehicles, and I think we probably will have to go back and look at what they've been reporting," she said in Los Angeles.

"It's not clear to me whether this would affect the U.S. reporting or only the European, and our systems are somewhat different. So that's just a question we're going to have to ask."