2009 (8/2008 build) MINI JCW Clubman. Had winter tires mounted and had the TPMS sensors changed since they were 10 years old (but still worked). Driving home from the tire place, the yellow speedo tire monitor light came on but my Schwaben scanner couldn't pick up any faults. After a while the flat tire yellow light on the speedo went off but the little ! in the triangle by the trip odometer went on. Using the stalk button to check info on it, only the tire symbol comes up. Reset it again and "Inactive" came up without an option to reset. (usually says active and reset). Went to the tire place and they re-initialized everything by pinging the monitors and through their scan tool to the OBD. Got it to reset which worked for about 5 miles, then the yellow light came back on, soon to be replaced be the ! triangle by the trip odo. Since then this first problem comes back over and over. Reset, light goes out after 3-6 miles, scan tool shows no problems, and light goes on again, followed by light on speedo going out and little triangle ! by trip odometer is back on and only fault on the tach when checking is the tire monitor symbol. All other times I was able to get "Active" and "Reset" on the screen. When I scan, I get plausible values for temp and pressure (except it reads 3.5 Bar when I think it means to say 35 psi) at all 4 tires, and if I let out 10# the red flat tire light comes on as expected and goes out when the tire is refilled. So it seems like the sensors are all working ok, and the system does detect and notify a drop in pressure. Maybe there's some other compatibility glitch or incorrect setup or initialization. I'm going to put my summer tires back on later today to check if they still work fine like they did all summer. If not, then I guess I'll need to suspect the control unit ($280) as a possiblility. BTW, the summer tires were delivered last May mounted on new wheels with aftermarket TPMS sensors from Tire Rack installed, and they gave me no problems. They didn't need any fancy initialization, just 1 quick reset. Anyone have similar problems, and what was the solution?