Mercedes W212 E220 Injector Return Pipe Leak
Mercedes-Benz
E-Class
2009
OM651 2.2 CDI
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟡 Monitor Closely
The plastic injector return pipes on OM651 engines become brittle and crack at the unions, causing diesel smell in the engine bay. Fire risk is present if fuel contacts hot surfaces. The pipes are inexpensive but require careful access. Replacement with revised silicone pipes is recommended.
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 E-Class 2009 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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