German prosecutors have searched Audi's offices in Ingolstadt and Neckarsulm (the federal states of Bavaria and Baden-Württemberg).
Searches are conducted in connection with the investigation of the so-called diesel scandal - illegal manipulation of data on the amount of harmful exhausts.
Volkswagen Group, which includes the AUDI brand, on March 11 pleaded guilty to criminal offenses in the U.S. Court. The world's largest automaker said in court that it misled American regulators and customers, hiding the level of diesel engine emissions. If VW did not admit guilt, it could face potential fines from $17 billion to $34 billion.