If your truck is hard to start, has an annoying misfire or exhibits poor performance, it might be traced to a malfunctioning Crankshaft Position Sensor, which is the most important of all engine management sensors. And once it fails, the engine will simply not start. These Crankshaft Position Sensors are ready to install, matches the fit and function of the OEM sensor, including a factory-style connector for plug-and-play installation. Includes new mounting bolt.