The tire pressure monitoring system in a vehicle is a useful tool designed to alert you as a driver when the pressure in your tires might be too low. The tire pressure monitoring system, or TPMS, will relay information from your tires to the computer in your vehicle. They are generally designed to detect if a tire's pressure has dropped to at least 25% below the recommended pressure level. A warning light or message will come on your dashboard if this is the case. The TPMS is an important system because it allows you to know of potential problems as a driver. It's important that the system is functioning properly and that all parts are in good condition. The most common reason for a system to fail is simply use and age. The batteries inside the system can start to fail. They also can corrode in some cases. Find OEM replacement tire pressure monitoring systems here for a range of Mercedes-Benz models.