 Jacky Eeckelaert, Räikkönen's race engineer, said the driver "drove a perfect three days, like a driver who's been doing it for 10 years" and Heidfeld stated he was happy for his teammate.Five days after the race, Frentzen wrote on his website of his suspicion Sauber illegally used traction control (a driver aid outlawed after the 1993 championship, which was permitted from the fifth round of the 2001 season, the Spanish Grand Prix) on their cars to provide themselves with an unfair advantage.He clarified his comments three days later to state the Sauber's fast acceleration out of the tight corners was achieved by an engine software package that lowered its power and eliminated wheelspin, "It cannot be ignored that something like that exists, there is simply no room for discussion about that.