Having previously admitted that as many as 11m of its diesel-powered cars could be fitted with "defeat devices" to beat emissions tests, VW took a €6.7bn provision that saw the auto giant slump to its first quarterly loss in a decade. Things seemed to be settling down a little for the company after it apologised, pledged to sort out the affected engines, shook up its management and started an internal investigation into what exactly had happened and how it took place. However, that internal probe appears to unearthed fresh problems at VW, with company announcing that there are "irregularities" in CO2 levels with about 800,000 cars. In a statement VW said: "Under the ongoing review of all processes and workflows in connection with diesel engines it was established that the CO2 levels and thus the fuel consumption figures for some models were set too low during the CO2 certification process. The majority of the vehicles concerned have diesel engines." This signals that it's not just diesel engines that are the source of VW's troubles, but that petrol engines are also affected. An early estimate by the Wolfsburg-based business put the "economic risks" of the latest revelation at about €2bn with recently installed chief executive Matthias Mueller saying that "relentless and comprehensive clarification is our only alternative”. Mr Mueller took over from Martin Winterkorn, who resigned five days after the scandal broke on September 18. Mr Mueller added: "From the very start I have pushed hard for the relentless and comprehensive clarification of events. We will stop at nothing and nobody. This is a painful process, but it is our only alternative. For us, the only thing that counts is the truth. That is the basis for the fundamental realignment that Volkswagen needs. "The Board of Management of Volkswagen AG deeply regrets this situation and wishes to underscore its determination to systematically continue along the present path of clarification and transparency.” VW Group said that it had started a "dialogue with the responsible type approval agencies regarding the consequences of these findings". The company's troubles have been compounded by news the previous day that Porsche has been dragged into the emissions-cheat crisis after environmental regulators confirmed they had found suspected "defeat devices" on a new engine range. The US-based Environmental Protection Agency told the crisis-hit Volkswagen Group that it is now looking at a 3.0 litre engine which is shared between Porsche, VW and Audi. In a "Notice of Violation" posted on its website, EPA said it had discovered 2014 to 2016 models have equipment to turn off emissions systems when the are not being tested.