I recently had my front passenger side tire replaced by Discount Tire (Monday). I now have same brand and size but a newer model tire since the factory tires are now discontinued (1,100 miles on car, Continental Procontact TX factory, new tire Procontact). I didn't expect them to calibrate the TPMS so I did it in the parking lot. Turned the error message off for a few miles...but, it came back on. Checked tire pressure at home and found the new tire had 40 psi. Corrected it and checked the other tires which all had correct pressure. Started calibration again in the morning before heading to work, one mile of city driving and a mile or so of tollway driving at 70 the light came back on. Looked closely at the manual which said calibration takes 30 minutes of cumulative driving at speeds between 30-60 mph. Figured that was the problem since I drive only about 2 miles of city streets, the rest at 70 mph and my commute is 28 minutes. Drove quite a bit at lower speeds today (Saturday) and I still get the error light. Tire pressures are all correct. I plan on taking it to the dealer soon but was hoping someone may have an easy solution.