Locate Audi A4 Tensioner Pulley Assembly. Explore Audi A4 Idler Pulleys & Audi A4 Idler Pulleys Replacement. Browse Audi A4 Pulley Tensioner Tool. Maintaining the idler pulleys of your Audi A4 is crucial for ensuring smooth engine operation and belt longevity. Regularly inspect these components for wear and tear, listening for unusual noises that may signal the need for replacement. Opt for high-quality pulleys, as they're made of durable materials designed to withstand the rigors of under-hood heat and stress, providing you with peace of mind and extended service life. When selecting a new idler pulley, choose one that matches your model's specifications?whether it's a serpentine or v-belt type?to guarantee a perfect fit and optimal performance. Installation is straightforward, but always ensure proper tensioning to maximize efficiency and prevent premature failure, keeping your A4 running like a dream.