I bought a Z4 in July and since then I have taken it back a few times for the same reasons.
1. Water is getting trapped under drivers side - I can hear the water swooshing when I brake, is this a know fault? The garage where I bought it claim it is because I park near a tree?
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?