<P> First - generation dTPMS sensors that are integral with the valve stem have suffered from corrosion . Metallic valve caps can become seized to the valve stem because of galvanic corrosion of dissimilar metals, and efforts to remove it can break the stem, destroying the sensor . A similar fate may befall an after - market brass valve core inside the stem that may have been installed by unwary technician, replacing the original specialized nickel - coated cores . (They can be distinguished by the yellowish colour of the brass .) Seizure of the valve can complicate repair of a tire leak, possibly requiring replacement of the entire sensor . </P> <P> There is controversy regarding the compatibility of after - market tire sealants with dTPMS that employ sensors mounted inside the tire . Some manufacturers of sealants assert that their products are indeed compatible, but others warned that the "sealant may come in contact with the sensor in a way that renders the sensor TEMPORARILY inoperable until it is properly cleaned, inspected and re-installed by a tyre care professional". Such doubts are also reported by others . Use of such sealants may void the TPMS sensor warranty . </P> <P> The dynamic behavior of a pneumatic tire is closely connected to its inflation pressure . Key factors like braking distance and lateral stability require the inflation pressures to be adjusted and kept as specified by the vehicle manufacturer . Extreme under - inflation can even lead to thermal and mechanical overload caused by overheating and subsequent, sudden destruction of the tire itself . Additionally, fuel efficiency and tire wear are severely affected by under - inflation . Tires do not only leak air if punctured, they also leak air naturally, and over a year, even a typical new, properly mounted tire can lose from 20 to 60 kPa (3 to 9 psi), roughly 10% or even more of its initial pressure . </P> <P> The significant advantages of TPMS are summarized as follows: </P>

Where is the sensor for tire pressure located