Another scandal shook Volkswagen on Tuesday when the company announced it had uncovered “irregularities” in carbon-dioxide emissions levels for about 800,000 cars in Europe. The German auto maker said it found the issue while investigating diesel emissions and could cost as much as $2.2 billion (€2 billion) to remedy. Volkswagen spokesman Eric Felber said a limited number of gasoline-powered cars were affected. The problem relates to the way in which CO2 emissions and fuel consumption were measured in the testing and approval process for some models. The auto maker has declined to say whether or not it believes the issue was a deliberate action. The setback comes a day after U.S. authorities accused Volkswagen of fitting nitrogen-oxide defeat devices on its larger diesel vehicles—claims the company has denied.