Checked the tire pressures.
Zooming down the 401 and the TPMS warning came on. Slowed up, carried on to destination ( 10 km). Tires looked OK and none of them felt warm at all. Had supper. Drove home carefully (50 km) , 401 at 80 Km/h even when it is not busy, is frightening...all these enormous trucks wooshing past. I reckoned that the tire would stay intact as advertised for that distance.
Got home, checked pressures, 3 ok and one a bit high (4 psi) reset that and went for a short drive to "reset the TPMS"
The TPMS on the B-class is driven from the ABS. If the ABS went wrong I would expect that a warning message and light would light up before or at the same time as the TPMS so I presume that is ok.
FGC!