We had the repair done with aftermarket sensors but it did not fix the problem. we have been told we have to take it to Cadillac to have it fixed. The price a year ago was $125 per wheel and we might as well have all of them fixed because once one goes out the others will soon follow. I was told this by Crossroads Chevrolet in Joplin, MO. We have to add air to the tires on a regular basis. Because of the multiple problems we have accumulated with this car we are not able to drive it. It more or less started falling apart at 120,000 miles. it does have nice heated leather seats, a nice ride, when it ran and looks nice.