Tire Reset Tool Auto TPMS Relearn Tool Universal U508 PLEASE CHECK IF YOUR MODEL IS ON THE LIST! Different Vehicle are variety in the way enter the relearn mode:Subaru,Chrysler, Dodge etc almost need use another OBDII Scan Tool (not include in this prodcut )to enter relearn mode MOST newer model vehicles (OEM) sensors will relearn the tire pressure sensor after driving 20 minutes or 20 miles Tips for using: 9V battery should be in good condition, NEW & fully charged.Please make sure antenna fit in CORRECT position.Do tire reset outside instead of in the garage.Position of tires is also important, Front tires have to be straight.Sensors should be original OEM sensors which well programmed.This U508 is for tire sensor reset, but sensor programming is not possible.It won't work if you've purchased aftermarket sensors with wrong frequency(315&433MHz Only).It NOT for heavy truck or van with more than 4 tires.If you need help, we will help you to solve the problem.