A waveguide quick disconnect clamp includes a first arm and a second arm, both arms having a first end, a second end, and a jaw pivotally connected to the second end. In one example, characteristics of an oxygen sensor are a basis for determining degradation of a temperature sensor. A Cassels-Tate pairing is determined as a function of elements of the Shafarevich-Tate group. In addition, the method includes the step of assessing whether a call completion ratio passes the second test, if the second test is determinate, by determining whether the difference is greater than a threshold.