Two problems related to front air bag sensor control have been reported for the 2011 BMW 335. The most recently reported issues are listed below.
The front passenger seatbelt sensor malfunctions and sets off the warning sound as if someone is siting in the seat when nobody or nothing is in the seat. This may cause airbag malfunctions or have it not deploy. This has been happening since the first day I bought the car several weeks ago. The issue is constant while I'm driving.
Passenger restraint system malfunction - notice started popping up at random now is on all the time without a passenger. Have been told there is no recall, but the same issue has been identified on all BMW sports seats from years 2006 and 2008, noticing complaints of the same issue for 2012 issues posted online as well. Previous issue was for a cracked sensor in the seat. Not happy that BMW has had this issue and will not review possible reoccurrence in newer models then 2008.