The Houston Texans and their first-year quarterback Case Keenum threw a scare into the Chiefs on Sunday but Kansas City managed to remain unbeaten with a 17-16 victory in front of 74118 relieved fans at Arrowhead Stadium.

Keenum playing in his first NFL game threw for 271 yards and a touchdown. But the Chiefs came up with a couple of big defensive stands and the NFL sack leaders sacked Keenum five times in the second half including four times in the fourth quarter.

The victory enabled the Chiefs to improve their record to 7-0. Houston 2-5 lost its fifth straight.

Chiefs quarterback Alex Smith was intercepted by Houston’s Shiloh Keh at the Texans’ 22 with 5:47 to play giving Houston an opportunity to take the lead but the defense held.

Given one more chance to upset the Chiefs Keenum was sacked by Tamba Hali who forced a fumble at the goal line that was recovered by Derrick Johnson. Hali finished with 2 1/2 sacks. He has five sacks in the last two games.

The Chiefs leading 17-16 missed a golden opportunity to score early in the fourth quarter.

Smith hit tight end Anthony Fasano at the Houston goal line and was so close coach Andy Reid challenged the spot. But the ruling on the field stood and after Jamaal Charles was stopped for no gain Reid elected to go for it on fourth-and-1.

However Smith’s pass sailed over open tight end Sean McGrath for an incompletion and Houston took over at its 1.

Keenum bought some field position when he hit rookie DeAndre Hopkins for 35 yards on a catch in which Hopkins got between cornerback Sean Smith and safety Eric Berry. The Chiefs forced Houston to punt but they boxed the Chiefs deep into their own end.

Keenum scrambled and threw a rainbow for 42 yards to Andre Johnson midway through the third quarter and the Texans turned that into a 47-yard field goal by Randy Bullock that drew Houston to within 17-16 with 4:21 remaining in the third quarter.

The Texans came into the game minus-12 in turnover differential and the Chiefs were a league-leading plus-12 but Kansas City coughed up the first giveaway when Charles fumbled at his 28 with 11:35 to play in the third quarter.

On the first play Keenum found tight end Garrett Graham on the sidelines and after eluding linebacker Justin Houston’s tackle Graham made it to the 1.

But the Texans were without a running back because of a hamstring injury to Arian Foster and an injury that temporarily forced his backup Ben Tate to the sidelines. Graham tried a sneak that gained a couple of feet; and fullback Greg Jones was stopped for a two-yard loss to the 3 by a submarining safety Kendrick Lewis.

Keenum’s back-shoulder throw to DeAndre Hopkins in the corner of the end zone was broken up by Marcus Cooper and Texans coach Gary Kubiak opted for a 21-yard field goal by Bullock drawing Houston to within 14-13 with 9:24 to go in the third period.

The Chiefs’ Quintin Demps a former Texan returned the ensuing kickoff 57 yards setting up a 22-yard field goal by Ryan Succop that gave the Chiefs a 17-13 lead with 6:07 to go in the third quarter.