Sebastian Janikowski was perfect on four field-goal attempts, and the Raiders (3-4) nearly became the third straight team to keep the Kansas City offense out of the end zone.
The Chiefs (1-6) scored their only touchdown with 2:27 left in the game.
Darren McFadden ran for 114 yards, and Denarius Moore and Darrius Heyward-Bey had touchdown catches for Oakland, which has won two straight after losing four of its first five.
Matt Cassel threw for 218 yards in place of Brady Quinn, who left in the first half with what the team called a "head injury." Quinn had started his second straight game.
The Chiefs have lost four straight and still have not led in regulation this season.
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