Six Italian-based executives of the group were placed under investigation, including VW Italy's CEO Massimo Nordio and Luca De Meo, the marketing and sales chief of the Italian branch of Audi, another VW company, the AGI news agency reported.
The raids took place at VW's Italian headquarters in Verona and Lamborghini's base in Bologna.
They followed the filing of a fraud suit by Italian consumer rights group Codacons on behalf of 12,000 Italian owners of vehicles made by Volkswagen and its subsidiaries.
Volkswagen has said 650,000 of its vehicles sold in Italy had been fitted with software designed to cheat on pollution tests.
