This is a known fault which showed up on many of our Z4's here in the states. I was fortunate that it showed up under warranty and BMW replaced it. It can be fixed, via replacement. I have no idea what that would cost.
Originally Posted by kizzy848
2. Airbag warning light - it just stays on the first time I took it back the mechanic said it was passenger seat sensor and this light can come on if you move your seat? I'm pretty sure BMW would not design a car where if you move your seat the light comes on. Again is this a known fault?
2008 Space Gray Z4 3.0 si, Saddle Leather interior
2011 Nissan Frontier King Cab
2010 Lexus RX350