I have my Audi A4 Avant B6 times indulged in what, LED's for the license plate illumination. The installation was a little difficult but to create it, does not fit 100% accurate but who looks just as accurate if it "mm" exactly is installed, it comes down to the quality of light.
The Audi now affects "contemporary" with the LED's my FIS or Boarcomputer shows no error message!