FRANKFURT — United States investigators are continuing to pursue wrongdoing in Volkswagen’s emissions deception, charging a former manager at the carmaker’s Audi luxury car division who has been arrested in Germany.

The case against Zaccheo Giovanni Pamio, who was head of thermodynamics in Audi’s engine development department, presents a rare opportunity to bring a suspect to trial in the United States.

Most of the accused former managers are safe in Germany because it does not extradite its citizens. But Germany is not necessarily a refuge for Mr. Pamio because he is Italian.

Mr. Pamio, the eighth former Volkswagen executive to be charged by the United States government, was arrested by Munich authorities this week. His arrest is the first on German soil related to Volkswagen’s emissions fraud.