BMW changed the tire pressure monitoring sensors (TPMS sensors) in 2010 to a different type than the one previously used in 2007-2009 3 Series models.
They are not cross-compatible. If you have wheels from a 2007-2009 BMW 3 Series car and would like to use those wheels on your 2010-2011 3 series BMW, you'll need to purchase the newer sensors.
Fortunately, these sensors are available at a low cost from Tire Rack. Sensor-only orders need to be placed by phone.