NASHVILLE, Tenn. — Randy Bullock kicked a 44-yard field goal with 4 seconds remaining and the banged-up Tennessee Titans rallied from a 10-point halftime deficit to beat the San Francisco 49ers 20-17 Thursday night.

The Titans (10-5) are a win or a Colts’ loss away from clinching their second straight AFC South title despite losing three of their previous four games to drop from the AFC’s top seed to third. Indianapolis plays Arizona on Saturday.

Ryan Tannehill threw for just 40 yards in the first half but finished with 209 yards and a TD for Tennessee. A.J. Brown caught 11 passes for 145 yards, hours after being activated off injured reserve, and his 18-yard TD catch gave Tennessee a 17-10 lead early in the fourth.

“It was all on us and we just had to make a play,” Brown said. “Then we had to make another play. That was the mindset. Just come out here and make plays, so that’s what we did.”

The Titans also picked off two passes, sacked Jimmy Garoppolo twice and forced the Niners to turn it over on downs once.

The 49ers (8-7) lost for the second time in seven games as they try to hold onto a wild-card berth in the NFC.

Garoppolo tied it with a 2-yard TD pass to Brandon Aiyuk with 2:20 left, a score set up by a 56-yard catch-and-run by Deebo Samuel down to the Tennessee 6.

This was the Niners’ first loss after leading by 10 or more at halftime under Coach Kyle Shanahan – they had been 18-0 in the regular season and playoffs with those leads. They hadn’t blown such a lead since Week 14 of 2016 to the Jets under Chip Kelly.

Tennessee played without the left side of its offensive line, with left tackle Taylor Lewan out because of an injured back and left guard Rodger Saffold on the reserve/COVID-19 list. Rookie Dillon Radunz, a second-round pick out of North Dakota State, replaced Lewan, and the Titans gave up four sacks.

The Niners dominated the first half but missed chances for a bigger lead.

Garoppolo threw for 322 yards and moved the 49ers down the field at ease early, setting up Jeff Wilson’s 1-yard plunge on the opening drive and giving them goal-to-go on the second possession. Titans cornerback Jackrabbit Jenkins beat 49ers tight end George Kittle for an interception in the end zone.

A face mask penalty on Pro Bowl left tackle Trent Williams forced the Niners to settle for a 48-yard field goal by Robbie Gould and a 10-0 lead.

Tennessee finally strung together a 13-play drive to open the third quarter, matching its first-half production at 55 yards, with Tannehill completing three straight passes on third down until missing a screen to Jeremy McNichols. Bullock kicked a 38-yard field goal to pull the Titans within 10-3.

Titans safety Amani Hooker picked off his first pass this season on the Niners’ next play, returning it 21 yards to the San Francisco 18. D’Onta Foreman finished that short drive with a 3-yard TD run.

Then the Tennessee defense, as healthy as it’s been in weeks, forced the Niners to turn it over on downs at the Titans 41 late in the third.

INJURIES

Samuel returned after going down at the end of his 56-yarder, and Niners defensive lineman D.J. Jones hurt an ankle. Titans defensive lineman Naquan Jones went down late in the third quarter. Brown had been out since injuring his chest in Week 11 against Houston.

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