When I did my HID install I had to get the error eliminator. It is a part that goes inline and tricks the computer to think the headlights are ok. The hid bulbs don't have an element in them so the computer will think they are burned out.. Some say they have done the install without the error eliminator and had no problems. I decided not to take the chance and got the extra parts and didn't have any issues. Hope this helps. Good luck.