Genuine OEM Nissan Auxiliary Belt Tensioner, part number 1175000Q2L. This component is crucial for maintaining the correct tension on the engine's accessory drive belt, ensuring all driven components like the alternator, water pump, and A/C compressor operate efficiently. Proper tension prevents belt slippage and premature wear. Genuine OEM ensures precise spring tension and high-quality bearing construction for smooth, quiet operation and a long service life.