Mercedes E220d OM651 Injector Noise vs Fault
Mercedes-Benz
E-Class
2009
OM651 2.2 CDI
⚡ Quick Summary
Severity Level
Low
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟢 Low Priority
The OM651 piezo injectors are notably audible at idle. This is normal for the design. Genuine injector fault causes a misfire on one cylinder, rough running and P030X codes. Injector replacement costs £250-500 each. Balance the injectors (test flow) before condemning.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz E-Class 2009 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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