I recently purchased a 2009 535i with the M sports package and after 3 days of driving it I received the 'Fault in passenger restraint system' warning on my IDrive. I dropped off the car at the dealership on Friday. I called them on Friday before closing and was told they are still working on it. The dealership closed on Sat and on Monday I called and was told they were removing the passenger seat. I'm wondering how long it will take if it was an issue with the sensor mat and if they already have the parts at the dealership? It's a bit frustrating because I've only had the cars for a few days and it's been in the shop longer than I've had the car.