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As your engine's camshaft spins, its lobes come in contact with the roller arm, which open your exhaust valves. When your cam is worn down, it may not operate within specified limits and cause your engine to misfire or worse.
* 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.
