The FIA has referred Red Bull to the stewards of the German Grand Prix for a suspected breach of Formula 1's technical regulations.
A statement released by FIA Formula 1 technical delegate Jo Bauer said that the matter related to the engine torque maps on both Sebastian Vettel and Mark Webber's cars.
The FIA highlighted that the reduced torque in the mid rpm range on both cars was a breach of the regulations in itself, but also because it could offer an illegal aerodynamic benefit as well.
This suggests that the FIA suspects that there could be a benefit related to the exhaust blown diffuser technology that was effectively curbed at the start of the season through a package of regulations that included those covering engine mapping.
"Having examined the engine base torque map of car numbers 01 and 02 it became apparent that the maximum torque output of both engines is significantly less in the mid rpm range than previously seen at other events," said Bauer in the statement.
"In my opinion this is therefore in breach of article 5.5.3 of the 2012 Formula 1 technical regulations as the engines are able to deliver more torque at a given engine speed in the mid rpm range.
"Furthermore this new torque map will artificially alter the aerodynamic characteristics of both cars which is also in contravention of TD 036-11. I am referring this matter to the stewards."
Red Bull team principal Christian Horner told AUTOSPORT: "I'm not aware of any irregularities. The result was declared after qualifying."