Can you feel your tires being dragged under your car's weight? You can't? Well, of course. And neither will you be able to tell the difference between under and over inflated tires by just looking or feeling. That's why, pursuant to the TREAD Act, all cars made or sold in the US are mandated to have TPMS (tire pressure monitoring system) technology as standard equipment starting 2008. The system uses a TPMS sensor on each wheel that monitors tire pressure. The information goes back to the TPMS module for processing. The only problem is, when a TPMS sensor goes out, the module has to be reprogrammed all over again for it to relearn the supposed tire pressure for that particular wheel. Sounds like a lot of work, don't you think? But it's worth it, actually. Hundreds of road accidents occur each day. Some, if not most, of these accidents are related to either under or over inflation of the tires. Yes, both can and will cause tire explosion if not properly adjusted. Again, it'll take more than visual, touch or kick inspection to tell whether a tire is under or over inflated, so a TPMS will really, really help. It's all a matter of fitting installing the module and an individual TPMS sensor on each wheel. If you have separate wheels for wet, dry and winter seasons, you'll be needed to put a TPMS sensor for each of those. Not a problem. Sensors are available right here at Car Stuff.