The used car dealer I purchased from installed a used sensor but couldn't get the TPMS light to turn off after a Chrsyler dealer did relearn prior to my purchase. I went and got four new Mopar TPMS sensors for $125 and also replaced the Homelink garage unit (Ebay $70). Also got four new BF Goodrich g-Force COMP-2 A/S tires.

Turned out Palmer Chrysler (Roswell GA) couldn't get the DRB III to communicate in order to relearn. Their tech determined that a wire behind the OBDII port had broken. After fixing wire, the scan tool would commiunicate and car relearned successfully and light turned off. Cost $120 for repair wire and relearn.

The light did go on yesterday (first time in 3 months) but car hadn't been driven for a month. After starting several times it went off and I drove to service station and made sure pressure was 32 front/33 rear. One tire may have been 29-30 psi, drove around some and no issue with light. Will check again today.