Genuine OEM Hyundai Serpentine Belt Tensioner Assembly, part number 252802G105. This assembly maintains the correct tension on the engine's serpentine belt, which drives accessories like the alternator, power steering pump, and air conditioning compressor. It is typically mounted on the engine block or a bracket. Constructed from durable cast aluminum with integrated idler pulleys, this assembly weighs approximately 1.02 kg. Choosing a genuine OEM tensioner assembly ensures precise spring tension, proper pulley alignment, and robust construction, which are essential for preventing belt slippage, premature wear, and accessory malfunction.