Wow, I had no idea that there was such a big deal about this.
For those wondering... here is the Final NTSA report.
http://www.nhtsa.dot.gov/cars/rules/rulings/TirePresFinal/Index.html
The short of it...
This document establishes two compliance options for the short-term, for the period between November 1, 2003, and October 31, 2006. Under the first complianceoption, a vehicle''s TPMS must warn the driver when the pressure in any single tire or in each tire in any combination of tires, up to a total of four tires, has fallen to 25 percent or more below the vehicle manufacturer''s recommended cold inflation pressure for the tires, or a minimum level of pressure specified in the standard, whichever pressure is higher. Under the second compliance option, a vehicle''s TPMS must warn the driver when the pressure in any single tire has fallen to 30 percent or more below the vehicle manufacturer''srecommended cold inflation pressure for the tires, or a minimum level of pressure specified in the standard, whichever pressure is higher.
And another find.... The 300c is listed to have Continental ContiTouringContact tires... I looked and I found this on the Continental website.
Continental TPMS System
Just some interesting info.....