Following more than four hours of presentations and discussions between the stewards and the various teams involved in the dispute, the FIA issued a statement confirming that the stewards believe the cars are legal.
Ferrari, Renault and Red Bull Racing had lodged protests against their rivals because they believed the designs of their diffusers were illegal. BMW Sauber had also been due to join the protest, but their complaint was rejected on a technicality after it was not correctly submitted in time.
The teams, however, have confirmed they will appeal against the stewards' decision, which will force the matter to go to a hearing of the FIA's International Court of Appeal.
Such a meeting cannot take place until after the Malaysian Grand Prix, meaning that Brawn GP, Williams and Toyota will unofficially be racing under appeal at this weekend's race in Australia and would likely be subject to another appeal at Sepang.