My wife's 2018 Q7 has had a burnt DRL on the drivers side for about 2 years now and I'm exploring replacing it if I can find a used headlight assembly at a decent price. Does anyone know what causes the LED to burn and turn yellow? I would like to prevent it from happening again (if possible) or is it just luck of the draw with the quality of the part? I was also wondering if there is any way to adjust the brightness of the DRL using VCDS.
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