The tire pressure monitoring system (TPMS) in 2004-06 BMW 6-Series vehicles keeps track of pressure levels in all four tires. If a significant drop in pressure is detected, the system will turn on a red tire pressure warning message on the control center, and also sound a warning signal. If there is a problem with the system itself, the warning light will be yellow.
Tags: BMW 6-Series, Tire pressure monitoring systems, TPMS