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Updated original post to include modification for LED fog lights. I haven't tried this mod, so if somebody does - please let me know if it works.

Updated original post to show correct resistor for right fog light in image.

Still not tested this out yet. Hopefully soon but just not had enough time. Dr. Electron do you get any interference with radio reception when using led bulbs or is it fine?

I installed an aftermarket head unit almost immediately when I got the car, so that I could use CarPlay. I stream audio 99% of the time, and the only radio station I listen to is NPR - and even that is rare. That station doesn’t have great reception in my RS4 despite working fine in every other car I own. But other stations seem to be fine in the RS4. Could be the LEDs, but I haven’t actually shut them off to see if they’re the problem.

I've found the radio reception in my RS4 to be awful, pre and post led lights....

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So finally managed to get round to replacing all the light bulb resistors on the board that you have mentioned here so will swap stuff over when I get the chance and test out. I’ve got a shark fin aerial to be installed in the car as my aerial reception is poor with the <beep> rear window aerial and then even worse with led bulbs

Tested out the ecu only for the DRL bulbs so far and it’s working!