My 2007 S-60 randomly turns on the tire system problems warning and the tire warning icon lights on the dash. This may stay on for hours or it may go off after a few minutes. The dealer says that the computer doesn't tell which tire has the bad sensor so I'd have to bring it in when the light is on to find the bad one. Since the light doesn't stay on long, it is unlikely that I will ever be at the dealer when it's malfunctioning.
Is there some easy way to check? If so, I'd just pull over when it goes on and run around the car with a geiger counter or whatever to identify the bad one.
Paul