One of the diagnostic mantras preached by service experts today is “test before you touch.” You should always use a TPMS tool to activate and check the response signal from each tire pressure sensor in each wheel before you do anything else. This will tell you:

            •  Whether or not each sensor is capable of generating a
    signal; and

            •  If the sensor is generating a signal, whether or not the
   pressure reading is accurate.

In this article from TechShop Magazine, you’ll learn more about today’s tire pressures and TPMS tools and procedures.