The 2012 BMW 135i has 4 recalls, the most serious being two separate driver's airbag inflator defects where the inflator can rupture or explode and send metal fragments into the cabin, potentially causing serious injury or death.
The airbag inflator issue has been the subject of prior repair attempts that did not fully resolve the problem, which is why it appears across more than one recall. On the drivetrain side, the constant velocity joint can break and cause a sudden loss of propulsion while driving. There is also an electrical concern: the wiring harness for the cabin blower can overheat, melt its connectors, and start a fire even when the car is parked and unattended.