If you are removing sidemarkers, the car won't care. lol it's not going to throw any error messages.
BUT, if you're installing LED bulbs into the sidemarker then you'll get start-up flashes. No hyper-blinking when you actually utilize it, but it will have cold/warm bulb checks, which will cause these "flickers". Only way to get rid of them is through coding. Contact Christina@LTBMW.
1. Car doesn't throw codes with LED sidemarkers or removal of sidemarkers
2. No Hyper-blinking when LED bulbs are installed in sidemarkers
3. Flickering occurs with LED bulbs during cold and warm checks
a. Only way to remove this is through coding.