Maybe common knowledge, but I'm leaving this here for posterity's sake. You can buy TPMS sensors from a multitude of sources, but I've always bought from https://www.pdqtpms.com/ The factory "reset/learn" remote is part number 8C2Z-1A203-A. Here is the procedure that works for me and others (taken from the AM site, with corrections/additions for the idiots who wrote it): To start with you'll need a TPMS activation tool [part number mentioned above]. Once you've installed your sensors, make sure your tires are inflated properly according to the placard on your door jam. Then you can start the re-sync process. Steps 1-6 need to be done within a minute. 1 - Put your key in the ignition, but don't turn the key 2 - Press and release the brake pedal 3 - Turn the key from "off" to "on" three times, ending at the "on" position 4 - Press and hold the brake pedal for two seconds, and then release it 5 - Turn the ignition to the "off" position, but don't remove the key 6 - Turn the key from the "off" to the "on" position three times, ending at the "on" position If you did everything in under a minute, your horn should sound once, the TPMS light will flash, and the message center will display "train left front tire". If the horn sounds twice, you'll need to try steps 1-6 again. Training the sensors goes clockwise from left front. When you finish training one tire, don't spend more than two minutes moving to the next tire, or you'll have to start over. To train the sensors: 1 - Hold the activation tool against the tire's sidewall near the valve stem with the arrow on the tool pointing towards the rim 2 - Press and release the green button and wait for your horn to sound again. The light on the TPMS tool should turn red. If the horn sounds within ten seconds of the light going on, training that tire's sensor worked. 3 - Repeat for the other three tires. The message center should display "training complete" when done. If the horn sounds twice when you finish the last tire, the reset process didn't work, and you'll have to start over.