Just want to say thanks to you and the other posters. I have 2005 Prius that developed the headlamp leveling fault couple years ago, then miraculously cured itself...only to return this summer and not go away. So, 11 years in to ownership, and years after the initial helpful posts on this problem, I bought a replacement OEM part, and installed it myself. I would not have been able to diagnose, identify replacemenr part, and install without all your helpful information. My sincere thanks!