Red Bull has been referred to the German Grand Prix stewards after it emerged that the team may have broken F1's regulations during qualifying at Hockenheim.

A statement from F1 technical delegate Jo Bauer released on Sunday morning revealed that an issue regarding the engine maps of the cars of Sebastian Vettel and Mark Webber had been discovered.

Bauer's statement revealed that a reduced torque level in the mid rpm ranger had been found which he deemed to be a breach of the technical regulations.

Steward will now discuss the matter and the legality of the two cars ahead of the race, with the possibility that penalties could be forthcoming.

"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," Bauer said in the FIA's 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."

Vettel and Webber had qualified in second and third behind Fernando Alonso's Ferrari, although Webber will take a five place grid penalty for a gearbox change.