All four were professionally installed on a 2012 Chrysler Town & Country in a recent tire purchase. A few days later the TPMS light was still on the dash. So yesterday I took the minivan on two 30 minute non-stop motorway trips at over 80 km/h all the time (30 minutes one way, 30 minutes back). I also checked the tire pressures before and after to make sure I was riding in the right range. After seeing all the positive reviews for this product I was sure it would help but no the TPMS light is still on. So these sensors didn't work for me and now they are installed in my car so there is no way to remove/return them and get my money back.