Hello and welcome to justanswer.
My name is XXXXX XXXXX it will be my pleasure to assist you today.
You should be able to reset this light through the instrument cluster. You need to cycle through to select the item, and then follow the prompts to restet it.
Here is a video that will walk you through the steps:
CLICK HERE FOR VIDEO
I hope that is helpful. Please let me know if I can be of any further assistance, or clarify anything for you.
It was my pleasure to help today, and I wish you the best with your reset and with your 3 Series going forward.
If satisfied with my assistance, please press the green ACCEPT button so that I may receive credit for providing assistance today. I am not credited or compensated whatsoever until the green ACCEPT button is clicked.
If the vehicle will not allow you to reset it through the cluster as the video shows, then it will need to be done at the dealer. That is the only reset procedure available. Since the adblue system is so strictly regulated by the EPA, this makes sense. I apologize for not realizing this reset was not available through the cluster.
Please let me know if I can be of further assistance. Please do not forget to use the accept button.
Many thanks and happy thanksgiving.