However, Sauber team principal Peter Sauber said in 2005 that Frentzen was the most important driver for his team but admitted that the driver need to work in a specific atmosphere and referred to his time at Williams where he was in conflict with technical director Patrick Head. () (Races in bold indicate pole position) (Races in "italics" indicate fastest lap)  † Did not finish, but was classified as he had completed more than 90% of the race distance. A non-championship one-off race was held in 2004 at the streets of Shanghai, China.