Kammala jumla mai zuwa: Don 1997<unk>1998 yana da wurin zama a cikin Formula One tare da sabuwar ƙungiyar Stewart Grand Prix, mallakar wani ɓangare na tsohon shugaban F3 Paul Stewart. Wanda ya kafa kungiyar Jackie Stewart sau daya ya bayyana shi a matsayin "mafi kyawun matashin matukin jirgi da ya fito tun bayan Ayrton Senna", amma aikinsa bai cika ba. Ya zira kwallaye ne kawai a gasar zakarun duniya a tserensa na karshe a F1,
1998 Grand Prix na Kanada; don sauran kakar an maye gurbinsa da Jos Verstappen. Magnussen ya fara 24 GPs, daya kasa da wanda ya shiga, saboda motar sa ta lalace a wani hatsari yayin fara gasar Grand Prix ta Brazil ta 1997 wanda ya sa ya yi ritaya kafin a sake farawa.