Ron Jeremy -- Gets His Car Impounded ... No License, No Ride

Ron Jeremy's night could have been a lot worse -- because it turned out he was NOT driving drunk ... however he was driving without a California license, so he got his car impounded.

The porn legend was pulled over in Hollywood Wednesday night after police spotted him driving erratically. Our photog witnessed police giving Jeremy a breathalyzer test, but he passed just fine. Ron told our photog he doesn't drink at all.

But it turns out Ron only has a New York license (even though he's lived in L.A. for years) so the cops towed his Saturn and Jeremy and his lady friend had to take a cab home.