How to Replace Serpentine Belt Tensioner 02-08 Audi A4 Apr 06, 2016Buy Now! New Serpentine Belt Tensioner with Pulley from 1AAuto http://1aau/ia/1AEBT00092 List of tools used: • 13mm Wrench http://1aau/tb4/1AXAA00010 Audi A4 B6 Idler Pulley Replacement (2002-2008) | Pelican There are two belts on the Audi A4 1.8 liter engine, the timing belt and the accessory or drive belt. Both belts have tensioners and idler pulleys that are used to keep the belts under a constant tension and running straight over the accessory pulleys. This article will deal with the drive or accessory belt repair and maintenance.
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