"Jansen made good pitches when he needed to against three of our best hitters," Angels manager Mike Scioscia said. "We didn't do nearly what we needed to do to support Matty Shoemaker. I thought he gave us a good chance to win."
Shoemaker (9-4) yielded six hits and struck out five over six solid innings for the Angels.
Andre Ethier had an RBI double in the second inning as the Freeway Series moved down the I-5 to Anaheim after the clubs split the first two games in Chavez Ravine.
Erick Aybar singled and scored in the eighth for the Angels, who missed a chance to move within one game of major league-leading Oakland in the AL West.
Hank Conger's one-out single in the sixth was the Angels' first hit.
"With a guy like him, you kind of disregard his past starts," said Conger, who caught Haren several times when they were teammates. "Because any day he could step on the mound and do what he did tonight. He's been an elite pitcher for a long time."
43,669 (96% full) - % is based on regular season capacity
75 degrees, clear
Home Plate - Jim Reynolds, First Base - Brian Knight, Second Base - Manny Gonzalez, Third Base - Chris Segal
Mike Trout is slugging .667 in at-bats to end in a breaking ball from a right-handed pitcher, the best rate among qualified hitters. Dan Haren has thrown the third-highest percentage of breaking balls among qualified pitchers (45 percent).
Matt Kemp (LAD): 6th HR in his past 9 games... He had 8 HR in his first 95 games this season.
The Dodgers are 10-1 when he homers this season.