I have summer and winter tires on my Vibe (Toyota), my Tahoe, and my CTS. I bought the winter tires at Costco (Blizzaks). I bought extra wheels for each, too, (eBay) so I needed extra sensors for all 3 vehicles. I change the tires over by myself and the guy at Costco resets the TPMS on the cars for free. I give him a tip for the excellant service. Each car behaves differently if you don't reset the sensor maps. Some count rev's per mile as well as pressure. That's another way to determine whether a tire is slowly going down by comparing it to the other tires on the car.
On the Tahoe, there are aluminum valve stems. I had put a stainless steel valve cap on the stem and after a year it BROKE when I tried to remove the cap. I bought a new one from eBay and replaced it myself. On the Caddy, I also rotated the tires front to rear and it caught the change. You can reprogram the system using the car's controls. You bleed down a tire until the horn toots and that tells you it has matched the sensor with the wheel position.
Done.
On the Tahoe, there are aluminum valve stems. I had put a stainless steel valve cap on the stem and after a year it BROKE when I tried to remove the cap. I bought a new one from eBay and replaced it myself. On the Caddy, I also rotated the tires front to rear and it caught the change. You can reprogram the system using the car's controls. You bleed down a tire until the horn toots and that tells you it has matched the sensor with the wheel position.
Done.