Does the Sport (not navi) have tire pressure monitoring, and if so when is it supposed to warn?

Checked pressure this morning, front tires were at 30. Let a little out to see when it would light. No light. Dropped the pressure to 19, drove up and down my driveway (long lane), no light.

Either the car doesnt have it, or mines not working.

 

The sensors only activate at a certain speed (>28 mph). The warning pressure is mid twenties or so as I recall. If you never got going above 30 mph on your driveway, then the sensors in the tire never turned on to detect the low pressure.

 

Any car sold in America that was manufactured after September of 2007 HAS to have TPMS. If the sensors arent working then the light would still be on as a result. If you look at your valve stems you'll notice it looks as though it's bolted to the wheel, the sensor is right on the other side.

 

What Malraux said. Plus if the light does come on due to low air pressure, after putting air in the tire you have to drive it like a 1/4 mile ( maybe less) so the light goes off over that certain speed.