Searches were carried out at Ford plants, at an unidentified company in the western German city of Leverkusen, and at about 30 other locations that included private homes, a statement said.
“We also arrested one person,” Cologne state prosecutor Christina Pohlen told news agency DPA.
Prosecutors said they had been working since September on an investigation that involved Ford staff and others suspected of corruption.
According to the prosecutor's office in Cologne, Ford staff are suspected of regularly receiving "material advantages" from companies that work with the automaker or which sought contracts with it.
In exchange, the Ford workers allegedly favoured benefactors when contracts were being decided upon or established false bills in their favour.
“The state prosecutor's office also examined the work stations of several people under suspicion at the company Ford,” company spokesperson Bernd Meier told DPA, adding that the company was working closely with investigators.