A state determining apparatus for an exhaust gas purifier is provided for determining the state of the exhaust gas purifier including an adsorbent for adsorbing hydrocarbons; in accordance with the temperature state in the exhaust system of an internal combustion engine. Upper and lower needle bearing assemblies extend respectively between the upper and lower yoke sleeves and the kingpins to guide the swivelable movement of the yokes about the kingpins. In one embodiment, the behavior of a process device as it transitions between different states is monitored for a single cycle of operation or over time to detect trends that indicate a potential failure of the process device. During idle mode, one antenna’s input receive chain is connected to two or more CSFs to detect the packet.