Are you sure that the corner lights are pushed in all the way? Make sure you hear the "click" otherwise you risk having the corner light fly off the car like it happened to me. It looked like it was in there properly, but it wasn't and flew off the car after a few months while driving on the highway. The previous owner of my car had clear coorner lights and replaced them for amber when he sold it to me and didn't put them in all the way.

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz