Audi will recall 850,000 A4 models worldwide due to airbag problems, with about half of the vehicles affected in the luxury carmaker’s two biggest markets of China and Germany.

Faulty software in A4 models delivered after 2012 could prevent front airbags from deploying, an Audi spokesman said today.

Audi said its faulty airbags are not made by Japan’s Takata Corp., which is at the center of a growing number of U.S. airbag recalls.

Audi is recalling about 250,000 A4 models in China, its biggest market, and 150,000 in Germany, while giving no regional breakdown for the remaining 450,000 cars.

The airbag problem is caused by a software fault, affecting A4 saloons, station wagons and allroad models.

The world’s No. 2 premium carmaker last week adjusted production of A4 models at its German plants in Ingolstadt and Neckarsulm, adding new software.

News of the recall was published earlier  by Germany’s Auto Motor und Sport magazine.

Seperately, Reuters reports, Nissan said  it is recalling 260,000 vehicles globally due to a defect in driver-side air bags made by Takata Corp.

The Japanese parts maker is at the center of a burgeoning number of recalls over air bags that could spray shrapnel at occupants.

The recalls affect Nissan’s March model, called Micra in Europe, and the Cube, a Nissan spokesman said. They are chiefly in Japan, with 104,905 cars, 30,000 in Europe and 11,000 in China, he said.

The Japanese recall covers models from 2008 to 2012, he said. He was not immediately able to provide more details on regions or model years.

 Read more about the Nissan Takata airbag recall here.