i changed my passat's chain tensioner. job was done about 1 hour alone cause i dont have friends.:) my car was noisy i could hear the chain running very loud.to be honest after the change its more quiet but i can still hear the chain so i think maybe i have to change the chain as well. also this link is very helpful but you dont have to losen the bolts on the exhaust cam.dont touch it...:D http://www.passatworld.com/forums/61-b5-information-base/215732-how-replace-1-8t-cam-chain-tensioner.html dont forget to buy a gaskets and clean everything from dust and oil before you reinstall the items. younger passat have an electric tensioner but the install is the same. any questinons just ask. steve