So, after hours of reading hundreds of threads about faulty TPMS sensors and random low tire pressure threads I was still unable to find anyone that had the exact problem I am having. I get a Left Rear Tire low pressure light after about 15-25 minutes of driving. When I scroll through to see the psi on the DIC it says it's at 1 psi. The tire isn't actually low by any means. In engineering mode it also shows 1 psi, not 148 like others have had. I had my roommate take my G8 to work with him to use their computer to relearn/test the TPMS and everything worked flawlessly. What could be the problem? Does the low tire light have to be on during the relearn process for the computer to recognize the fault? Why does it say 1 psi instead of 148 or -- like everyone else who has had a bad TPMS?