This Delphi 58X gray crankshaft position sensor SS11397 is engineered for 2007 and newer Gen 4 LS engines to provide precise crankshaft speed and position data to the engine control system. Accurate crank signal input is critical for proper ignition timing, fuel delivery, and overall engine performance. A failing crank sensor can cause hard starting, misfires, stalling, or no-start conditions. Designed as a direct replacement, this sensor restores reliable signal accuracy and installs without modification. Built to Delphi's OEM-level standards, it delivers consistent performance and long-term durability for daily-driven and performance LS applications.