Crankshaft Position Sensors monitor crankshaft position and rotational speed to provide critical data for engine timing and fuel injection. Typically mounted near the crankshaft or flywheel, these sensors utilize a magnetic or Hall-effect principle to generate a digital signal proportional to rotational movement. Output signals are sent to the Engine Control Unit (ECU), enabling precise ignition and fuel delivery. Sensor construction commonly includes a shielded pickup element and robust housing for durability in harsh engine environments. Failure manifests as hard starting, rough running, or complete engine stall.