Genuine OEM Audi Alternator Belt, part number 04L260849AB. This serpentine belt is responsible for driving the alternator, which generates electricity, and often powers other essential engine accessories like the power steering pump or air conditioning compressor. It is a critical component for the vehicle's electrical system and accessory function. Using a genuine OEM belt ensures correct length, tension, and material composition for optimal power transfer, reduced slippage, and extended service life, preventing unexpected breakdowns.