Audi=No fault code, no idea
The car knows what the resistance should be across the side light bulb. It is saying the resistance is wrong so you either havnt got a bulb in/have the wrong bulb in/ or have an LED in instead of a bulb. Basically the computer has cut the power to the bulb because it thinks its blown due to getting the wrong resistance signal back from it.
Thats a bit simplified but it should give you a clue
Ibis white Revo S3 and now matching Vivaro LWB HR 2900 :-)
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