The raids on a private home and offices belonging to Audi in southern German states Bavaria and Baden-Wuerttemberg "focused on the use of technical devices to manipulate emissions data in 3.0-litre V6 diesel motors for sale on the European market," the authorities said in a statement.
Some 14 people are now under suspicion in the probe into suspicions of fraud and illegal advertising relating to 210,000 diesel vehicles sold since 2009, which also saw prosecutors search the homes of six current and former employees last Wednesday.
Most of the people targeted are engineers involved in motor development, the prosecutors said last week, reiterating today that no Audi executives are among the suspects.
An Audi spokesman confirmed the raids had taken place, adding that "we are cooperating fully with the authorities".
Two Audi workers have been arrested in recent months, with a former motor development executive still in custody while another engineer was released in November.
Audi parent Volkswagen admitted in September 2015 to fitting 11 million cars sold worldwide with so-called "defeat devices" designed to make them appear less polluting in regulators' tests than they were in real driving conditions.
And the reputation of diesel-fuelled vehicles has suffered even in car-mad Germany, with their share of the overall market slumping in favour of petrol-powered variants.
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