Mercedes C220d OM651 Top End Tick — Normal vs Fault
OM651 diesel engines tick audibly at idle from piezoelectric injector operation — this is completely normal. A tick that is louder on one cylinder than others, combined with rough running, indicates a failing injector. Injector balance test via Mercedes diagnostics distinguishes normal from faulty operation.
Onarım / Çözüm
No confirmed fixes yet. Share yours below.
⚠️ Yanlış Teşhis mi?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz C-Class 2015 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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