Jaguar were bought out in November 2004 by Austrian energy drink company Red Bull and were renamed Red Bull Racing. During winter testing in 2005, Klien tested several times for Red Bull Racing alongside Vitantonio Liuzzi and David Coulthard. Klien secured the second race seat at Red Bull, alongside Coulthard. Klien started the year with points finishes in the first two races before retiring in Bahrain before the race had even started due to an electrical problem.