Mercedes E-Class Engine Knocking — OM642 Injector Rattle
A tapping or rattling noise from the top end of OM642 V6 diesel is typically injector mechanical noise, not bearing knock. OM642 injectors are notably audible. Genuine bearing knock is deeper and more resonant. Injector noise that worsens indicates injector wear requiring replacement at £200-400 each.
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz E-Class 2006 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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