Anton Marklund has been stripped of his maiden World Rallycross win at the Norwegian round at Hell following a post-race technical inspection.
The decision hands Niclas Gronholm his first WRX win.
GC Kompetition driver Marklund was disqualified from the entire event by the FIA stewards, as checks at post-race scrutineering that found the front bumper support-bar on his car was too thick.
"The front bumper was found not to be in compliance with the technical regulations of the FIA World Rallycross Championship," an FIA bulletin read.
"The front bumper mounting was changed from the original and this cross member was made from a tube which [the] diameter was 50mm and the material thickness was 1.96mm."
As per Appendix J Article 279.10.2.d of the WRX technical regulations, the maximum thickness of the material used on the front bumper mountings must not be greater than 1.5mm.
Gronholm had finished third on track before being promoted to second when Kevin Hansen was penalised for contact between the pair.
He had topped qualifying and won the first semi-final in torrential conditions, but lost out in the final after making a poor start.
Gronholm lost out on a career first victory in the opening round of the season after he won on track at the Yas Marina track but was later penalised for contact with Kevin Hansen and was eventually classified second.
Marklund has been removed from the full classification, so after Gronholm takes the first win for his father's GRX Taneco squad, Hansen finishes second, as he did originally on track.
Janis Baumanis now claims a maiden WRX podium with third place.