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LOS ANGELES — Maybe the Yankees finally found the key to beating LA: a junk-balling journeyman throwing at speeds below what they drive on the 405.

And maybe, just maybe, Ryan Yarbrough, the former Dodger, had a little bit of needed inside info.

That’s just a guess, of course. But how else to explain his six marvelous innings of one-run baseball after the Dodgers destroyed Yankees pitching — including Cy Young candidate Max Fried — all weekend?

The lefty Yarbrough, who’s been nothing short of a revelation in pinstripes, continued his surprising recent mastery in shutting down his old team, one of the best in baseball and, more to the point, the Yankees’ recent nemesis. Yarbrough threw almost every pitch in the 60s, 70s and 80s and still managed to dominate the high-powered Dodgers, thanks to unusual angles and varying velocities, in the Yankees’ necessary 7-3 victory before a sold-out Dodger Stadium.