I bought these sensors in May 2021 to put in my wheels that are used for summer tires. After mounting the tires on the wheels, the rear tires were not programmed to the car. The only way to program them is to put all the wheels on the front and then train them. Everything seemed fine until I drove over 30 minutes and the tire pressure sensor error message kept popping up on the dashboard. The only reason I bought these sensors was to replace my 10 year old factory sensors which gave me the same message. However, sensors from another company were installed on my winter wheel set 2 years ago and I have never had any problems programming them or falling while driving.