The manufacturer’s South Korean unit allegedly falsified 37 emission and noise-level results to secure approval to import 26 models, dating back to August 2010 from February last year.
Yonhap News Agency claims the models affected include the Volkswagen Golf GTD and Audi RS7. The Seoul Central District Prosecutors’ Office is thought to be summoning company officials this week to question them.
It is alleged that the manufacturer submitted existing test results of similar models before the new model results were received in a bid to fast-track launches and save money, according to Yonhap.
A spokesman from Volkswagen Germany said: “We do not comment on ongoing investigations. Audi Volkswagen Korea fully cooperates with all relevant authorities.”
Volkswagen has begun recalling cars in the UK to apply a software fix on its vehicles affected by the emissions scandal.