2.0 TDI tapping sound

Djemu

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Aug 6, 2018
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Hello all,

Past couple days my car's developed a noise, bit with no other symptoms. Last service was 3,500 miles ago. Thought it might be the cambelt wearing at first but I've identified where the noise is coming from (check video).


As you can see it's the plastic popping in and out as the engine turns and gets quicker and louder at higher RPM. Does anyone know what this is?