A US regulator found software in some Audi vehicles that lowered their carbon dioxide emissions if it detected they were being used under test conditions, Bild am Sonntag reported.
The California Air Resources Board (CARB) discovered the software in an automatic transmission Audi last summer, the German weekly newspaper said, without citing any sources.
CARB had no immediate comment and Audi was not immediately available for comment on Sunday's Bild am Sonntag report.
The paper said the device, which was not the same as the one which triggered last year's diesel emissions scandal at Audi parent Volkswagen, was also used in diesel and gasoline-powered cars in Europe.
VW's admission that it had installed software that deactivated pollution controls on more than 11 million diesel vehicles sold world-wide, triggered the deepest business crisis in the German carmaker's history.
Audi, the main contributor to VW group profit, has also admitted its 3.0 litre V6 diesel engine was fitted with emissions-control software.
Bild am Sonntag said the software discovered by CARB, which was installed in vehicles with certain automatic transmissions, detected whether a car's steering wheel was turned.
If it was not, indicating laboratory testing conditions, the software turned on a gear-shifting programme which produced less carbon dioxide than in normal road driving. If the wheel was turned in any direction by more than 15 degrees, the programme was switched off, the paper said.
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