“On the basis of raw data, some elevated measurements of nitrogen oxide were made in various driving and environmental conditions,” the Federal Office of Motor Vehicles (KBA) said in a statement.
The KBA will now take up the measurements with manufacturers and other government agencies, saying that until it has the results from further checks it won't take any regulatory action.
Neither did the KBA say which other car builders were affected or whether the new results indicated conscious dodging of emissions limits on their part.
Officials have been testing a over 50 different models of vehicle from manufacturers including BMW, Ford, Mercedes-Benz, Alfa Romeo, Dacia, Hyundai and Mazda.
One-third of the tests have yet to be completed.
Volkswagen has admitted to installing so-called defeat devices in 11 million cars.
The sophisticated software fitted into diesel engines skews the results of tests for emissions of nitrogen oxide, a pollutant associated with respiratory problems.
It has also faced allegations of elevated CO2 emissions from both diesel- and petrol-burning cars.