BMW owners have complained of odor under various conditions.
I have a 2011 BMW 328i and I get this sort of burnt chemical smell through the vents when the heat is on. It doesn’t happen until I have been driving for 10-15 minutes. After that you get the smell on some low level all the time, but it seems to be briefly exacerbated by making a hard turn (i.e. a U-turn). You get a stronger whiff coming out of the turn and then it returns to baseline. I also smell it stronger when setting off in low gear (1st or 2nd) like from a stop sign. https://community.cartalk.com/t/smell-from-vents-bmw-328i/89768
BMW has recently issued a recall. Recall Campaign 17V-676 Blower Motor Wiring According to BMW, the problem involves the blower motor which monitors heat and air conditioning.
Owners with problems may be entitled to compensation for vehicle problems, loss of use, and other damages. Call (973) 598-1980 for a Free Consultation