Mercedes E220d OM651 Injector Noise vs Fault
Mercedes-Benz
E-Class
2009
OM651 2.2 CDI
Safe to Drive?
⚠️ Drive with Caution
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.
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