Kevin Magnussen has lost his victory in the first Formula Renault 3.5 race of the weekend after his car failed post-race scrutineering.
The Dane took a dominant win on Saturday afternoon to take him to the brink of the FR3.5 title.
According to a statement released by race officials on Saturday night, Magnussen was excluded for "Non conformity of car 20 with the 2013 Formula Renault 3.5 technical regulations article 3.1.1 and/or page 20 of the nomenclature about the DRS flap.
"Breach of the art. 19.15 Sporting regulations and art.3.1.1 technical regulations and/or page 20 of the nomenclature -- anything that is not explicitly and expressly authorised by the technical regulations is prohibited."
Magnussen's exclusion means that Antonio Felix da Costa is promoted to race winner, with second-placed Stoffel Vandoorne reducing Magnussen's championship lead to 18 points with three races remaining this season.
Da Costa said on Twitter: "I feel sorry for Kevin, he drove well today."
DAMS, which was involved in controversy earlier in the day when it was understood to have triggered an investigation into Vandoorne and da Costa's sector times under yellow flags, has already expressed its intention to appeal the decision.