Audi and Skoda say they have a total of 3.3 million cars fitted with the software that allowed parent company Volkswagen to cheat US emissions tests.

Some 2.1 million Audis affected worldwide include 1.42 million in western Europe, with 577,000 in Germany, and almost 13,000 in the US.
Czech-based Skoda said 1.2 million of its cars were involved, but has yet to give a country or model breakdown.
Separately, German prosecutors started a probe against VW's former boss.
Former chief executive Martin Winterkorn will be investigated over "allegations of fraud in the sale of cars with manipulated emissions data," German authorities said on Monday.

The Audi models affected include the A1, A3, A4, A5, A6, TT, Q3 and Q5 models, a spokesman told the Reuters news agency.