I'm in the process of upgrading tpo HID's on my 2003 E500. I bought the relay's etc. everything everyone told me I had to buy. Now I'm still getting my malfunction on the dash and my left headlight went out. Now the latest news I'm getting is that I have to take the car to Mercedes to hook it up to the Star Diagnostic Machine so they can switch the computer to recognize my HID's. Basically switch the computer from Halogen to HID's. Please someone confirm this for me because now I don't know who to believe. THANK YOU