Two problems related to side/window air bag have been reported for the 2011 BMW 335. The most recently reported issues are listed below.
Immediately after replacing the recall for the driver's side airbag, the light warning came on for the passenger side airbag. This happened while my vehicle was in motion after taking in my car for maintenance and the original recall.
On 2/5/2016, BMW issued a recall for the driver's front air bag (recall campaign no. 16v-071). I wasn't even notified about the recall! I happened to see this open recall in July 2017 after I received a recall for the rear driveshaft constant velocity joint (recall campaign no. 17v-067). It took almost 2 years for the driver's air bag recall to be fixed (it was finally made available to me in December 2017). Within a few months of getting the driver's side fixed, the passenger side air bag seat sensor malfunction light came on while I was driving the vehicle! I've spoken to BMW's service department & authorized BMW mechanics regarding the air bag sensor mat failing & was told it was a very common problem. That it was so common, the waiting list to replace/fix the malfunction will take 1-2 years (or longer). This malfunction has been recalled on previous BMW models�the recall needs to be issued on 2011 BMW's as it is still a major safety issue!.