One problem related to front suspension coil spring has been reported for the 2003 Cadillac STS. The most recently reported issues are listed below.
Car scrapes front end going into or out of driveways even at slow speed 1 to 2 miles an hour. Also hits curb parking stops. My mechanic told me to take it back to the dealer I pruchased it from and the warranty should cover it. The car is approximatly 7-8 inches from the ground and the rear end is about 15-16 inches high off the ground.