BusinessVW reveals new emissions row after finding carbon emissions 'irregularities'Clouds gathering: VW's emissions scandal could involve carbon emissions as well as nitrous oxideJulian Stratenschulte/EPAAngela Jameson5 November 2015Shares in Volkswagen plunged more than 10% today after the German carmaker admitted problems with the way it certifies carbon emissions from certain models.The company said the “irregularities” could affect 800,000 cars in Europe and cost it €2 billion (£1.3 billion). VW shares plunged €11 to €99.95, wiping more than €4 billion off its value.Analysts believe the CO2 issue could be potentially much bigger for the carmaker than the original nitrogen oxide emissions cheating scandal, which has affected 11 million vehicles in Europe and the US. Mis-stating carbon dioxide emissions also implies that fuel consumption data has been unreliable.Read MoreWH Smith hire turnaround veteran with package that could be worth £25mBlue Posts boss: If opening a pub becomes so risky, people just won't do itCulpeper pub boss: Rates system is not fit for purpose — and not fairSponsoredReset your wellbeing for the year aheadAnalysts at Exane BNP Paribas said the new revelations could mean another €4 billion in recall costs and "a harsher commercial impact".However, car dealership owner Pendragon said on Tuesday that it had so far seen "no impact" of the scandal on sales of used VWs.Additional reporting by ReutersMORE ABOUTVWVolkswagenCarscarbon emissions