Ive seen on here a thread linking to an ebay seller who sells LED number plate lights that wont give an error code. I decided to buy them and fitted them with no problems - they looked fantastic, a big improvement in look and in light!
That was 3 weeks ago and today I took my car for its MOT - it failed :-( Reason being that my number plate lights had stopped working! I couldnt work out why so decided to just get some new original bulbs but they wouldnt work either, I then checked all the fuses and they were fine. I then spoke to my brother who works on VW/Audi and he said it is likely that the computer would have turned the lights off as they are not suitable and that I would need to use VCDS to remove the fault code and get the lights working again. Luckily for me he has that software and he was spot on - error code came up on his laptop and with the click of a button the lights were sorted again (using original bulbs). If I didnt know someone with that software then I could have been looking at a trip to Audi to get it sorted.
Certainly wont be putting the LEDs back in thats for sure!