Kammala jumla mai zuwa: McLaren MP4-19 motar tsere ce ta Formula One wacce McLaren ta gina don kakar 2004. Adrian Newey, Paddy Lowe, Pat Fry, Mike Coughlan da Peter Prodromou ne suka tsara tsarin motar tare da Mario Illien wanda ya tsara injin Ilmor. Kimi Räikkönen da David Coulthard ne suka tuka motar. An bayyana shi a matsayin "fassarar da aka gyara" na McLaren MP4-18, amma ba ta kasance mota mai nasara ba. Tawagar ta sha wahala matsaloli daban-daban game da abin dogaro a farkon kakar, tare da ritaya takwas a cikin tsere biyar. An kuma dakatar da sarrafawar ƙaddamarwa da akwatunan gearbox na atomatik don, ma'ana direban dole ne ya fara amfani da masu sauyawa, kuma ya sami ingantaccen wurin ciji kuma ya saki mahaɗin da hannu, kuma. Wadannan direbobi na lantarki sun yi amfani da tawagar a cikin shekaru uku da suka gabata, tun daga 2001 Spanish Grand Prix. A tsakiyar kakar, an buƙaci sabon mota, MP4-19B. Wannan sabuwar mota ce da aka sake fasalin fasalin fasalin iska. Sakamakon nan da nan ya kasance mai kyau kuma ya ba wa tawagar fatan samun kyakkyawan karshen kakar wasa. Coulthard ya cancanci na uku don MP4-19B na farko a tseren
Gasar Faransa, ta biyo bayan karin maki da kuma podiums daga direbobi biyu. A karshe an inganta haɓakawa lokacin da Räikkönen ya ba wa ƙungiyar nasarar da ta samu a kakar wasa ta lokacin da ya lashe Grand Prix na Belgium.