Sauber will continue with Ferrari engines in 2015 despite their current Ferrari-powered challenger lacking in both pace and points.
Sauber have yet to get off the mark this season, a worry for the Hinwil team who even trail Marussia in the Championship.
Although some of the responsibility rests with Sauber's C33, Ferrari's engine is also to blame as it is lacking in performance compared to the likes of the Mercedes unit.
"It is one of the major factors," Kaltenborn conceded in an interview with the official F1 website, "but I don't think it is as easy as saying it is somebody else's fault.
"We always have to look at ourselves first and, being very honest about it, this...
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