A total of 2.1 million Audi cars were affected by the emissions cheating scandal, the German company said on Monday.
The Audi vehicles fitted with cheating software include 1.42 million vehicles in western Europe, among which 577,000 are in Germany, and 13,000 in the US, Xinhua news agency quoted a spokesman of the company as saying.
Audi's parent company Volkswagen Group earlier admitted that a total of 11 million cars were involved in the emissions cheating scandal.
The US Environmental Protection Agency (EPA) found the software on VW diesel cars showed false emission data.
The software installed by Volkswagen in its cars violated the Clean Air Act, the EPA said in a statement on Friday.
According to the findings of EPA, the software called "defeat device" by the EPA can turn on full emission controls only when the car is undergoing emission tests to make the car meet the legal emission standards, but during normal driving, the car will emit nitrogen oxides at up to 40 times the standard.
