Genuine OEM Hyundai Serpentine Belt Tensioner Assembly, part number 252812U010. This assembly is vital for maintaining the correct tension on the engine's serpentine belt, which drives various accessories like the alternator, power steering pump, and air conditioning compressor. It is typically mounted on the engine block or accessory bracket. Featuring a spring-loaded mechanism and durable pulleys, this assembly weighs approximately 0.3 kg. Choosing a genuine OEM tensioner ensures precise belt alignment, consistent tension, and the long-term reliability required to prevent belt slippage or premature wear of engine components.