My 2007 has had the solid TPMS light on for a year or so. I decided that while I was getting new tires, might as well replace those sensors. After the tire/sensor swap the light was still on solid and the tire shop said my OBDII connector was broken and couldn't make them work. So I took it to a...
Instead of a razor that could scratch up the aluminum use a piece of copper tube that is smashed on one end and sharpened with a file. It will scrape away crud without scratching up your mating surfaces. It can certainly be done with a razor but you need to be careful.