Depends on the year of the truck they came off of. With a Bartec scanner they need to be relearned for positions every time you rotate them and it can be put in learn mode by turning the hazard lights on 3 times quickly. But when it comes to relearning new sensor id's to the truck you need to tap the brake, cycle the ignition 3 times ending in the on position, and repeat the cycle until the vehicle honks. Then you can learn new sensor id's to the truck by scanning each sensor starting at the Drivers Front, it will honk each time the sensor is read and double honk when you are finished