updated 11:35 p.m. ET Dec. 18, 2005

INDIANAPOLIS - Perfection is now a thing of the past for the Indianapolis Colts.

Looking ahead isn’t so grim, though — especially with the Super Bowl still in their sights.

“It’s tough to go 16-0. You have to play well every week,” coach Tony Dungy said after his team was beaten 26-17 by San Diego to end its 13-game winning streak.

No, the Colts weren’t happy — the locker room was quiet and emptied quickly.

But the last team to start 13-0, the 1998 Denver Broncos, went on to win the Super Bowl, and several players from that team say now that losing their 14th (and 15th) games made the final victory easier.

“I never think losing helps,” Dungy said. “But if it brings us back for the last two weeks with more resolve, maybe some good will come of it.”

The Colts had erased a 16-0 deficit with a field goal and two touchdowns in a six-minute span of the third quarter. But the Chargers went ahead for good on a 49-yard field goal by Nate Kaeding with 6:41 left.

Then Michael Turner clinched it with an 83-yard touchdown run after rookie Luis Castillo sacked Peyton Manning to knock the Colts out of field-goal range.

“I think they’re the best team in the football. But all week, we felt we could beat them,” said San Diego rookie Shawne Merriman, who had two sacks and forced an important intentional grounding by Manning. “It will always go down in the books, no matter what happened before or after.”

The win kept San Diego (9-5) alive for an AFC wild-card spot and prevented Denver from clinching the AFC West. The Chargers will need help to make the playoffs.

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It also allows the Colts to rest starters for the final two games, having already clinched home-field advantage for the AFC playoffs.

And it certainly led to champagne celebrations by members of the 1972 Dolphins, the only team to complete a season undefeated.

“It’s just another example of how tough it is to run the table in the NFL. And while congratulations are in order to the Colts for the great run they had this year, it points out once again that the 1972 team was something special, even if we don’t always get recognized as such,” said Manny Fernandez, a defensive lineman on that team.

Said Dungy: “The only consolation now is that we won’t be asked all those questions, have all the media around and we can have more focus on our ultimate goal, to win the Super Bowl.”

Slide show   Week 15 of NFL action See upsets and upendings in images from this weekend's games.

The Colts played dreadfully for much of the game — almost as if they wanted to take off the pressure.

Manning was sacked on each of the first two series and also threw an interception, although he finished with 336 yards passing, many of them late in the game. Fortunately for Indy, Drayton Florence, who picked off the pass, fumbled it back as he was returning it.

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