Ii am on my second TPMS so when my wife experienced the "Defective Wheel" wheel warning. i had her do a visual and manual check she said everything looked fine, she drove home 60 miles. I looked at the tire when she got home it seemed fine, so i thought it was just another faulty monitor. The next morning, i pulled it out of the the garage and got a "flaat tire" followed by "Defective Wheel". So i checked the pressure and it was 22PSI!!!! All the other tires were fine. I filled it up to 40 psi drove a few miles and it seemed to be holding pressure. So i decided to make the 15 mile drive to the dealer to have them check it out. Problem found, a screw on the inside sidewall. So the TPMS did its job, my confidence is restored in the TPMS. And i credit the Dunlops for holding up for about 80 miles of driving with a rather large hole/screw in the sidewall.