I add a spoiler from a S4 to my A4. I just disconnected the rear window brake light an spliced in the led brake light. I thought the led would draw less power , But I believe it is know drawing to much "not sure" I tested it and the code came up high or low resistance I don't remember. I've seen post about l.e.d. taillights having the same problem. So help me out if you guys have any input thanks!