[Bstears]

I have a 2011 z4 35i. It recently started giving me tire pressure monitor malfunction errors. I've done a lot of searching and can't find a specific solution. I checked the tire pressure, had it checked and reset by discount tire, had the sensors checked and of course, have tried myself to reset the system through iDrive. Unfortunately, none of it has worked. I figured the sensors are now 6 years old, so I had all of them replaced today. The system was reset, and the error is back again. Any suggestions? Does anyone know where the TPMS module is located?