Audi A4 2.0 TDI Ticking Top End — Hydraulic Lifters
A ticking from the top end of A4 B8 2.0 TDI on cold startup that clears within 30 seconds is normal hydraulic tappet (lifter) behaviour as they fill with oil. If the tick persists beyond one minute at idle, a stuck lifter or camshaft wear may be the cause. Oil change with correct VW 507.00 oil often resolves persistent tick.
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Audi A4 2008 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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