The guide rails in your timing set for the 2.0T keeps everything tracking properly. Because it is made out of a plastic-like material, years of abrasion can wear parts of it away. The chain can get a little loose and cause noise in the chain.
* This part is designed for the TSI engine only. This can easily be found on the engine cover of your 2.0T VW/Audi. It will clearly be stamped TSI or TFSI.
