Factory shock is leaking - considering modification to coil over shocks - is it worth it and is it safe on this model BMW?

Have there been others with tires sensor malfunction that causes seat belts, ABS, Brake light, engine light, etc. to go on. Nearly had an accident due to deer and seat belts didn't restrain us. 2009 and only 12000 miles. BMW problem? How should I deal with this and now almost $900 bill?

Took door panel off today 2/1/2014 tested power to motor apon pressing up/down switch the power would come on 1/2 a second and off. I could hear and clicking from under the dash pulled lower panel and side panel to see there is no window relays like I thought. Just this black box mounted behind that panel and I think the clicking is coming from this. The pass window works great. Any suggestions??

white smoke sometimes come from tailpipe and car shakes and knock when i turn off engine

after 50 miles