I had just picked up the car from the volvo dealership where the car was there for two weeks. i stopped for gas and did some shopping and as i was entering highway the 'tire pressure low' warning light came on. i thought it was probably due to work that was done in the shop. i entered the highway and as i was speeding up, i noticed the noise coming from the wheels, noticed that there was a flat. the flat was due to tpms valve stem failing and as i was told later by the dealership, the loss of air was very quick and the 13 month old tire was damaged after only driving on low pressure for less than a mile. as i understand it would have been dangerous if it happened while driving at high speeds. after i took the car back to the dealership, they replaced all tpms sensors on the car due to the volvo tsb tj-24767 dated dec 2011 titled 'tire monitoring system - tpms sensor nut corrosion'. my main complaint is that volvo knew about this issue and neither they tried to replace the tpms sensors at a few times the car was at their dealership, nor they tried to educate the car owners about the possible risks. as a result, one of the tires was damaged which i have billed to pay for. *tr