Mercedes E-Class Coolant Smell — EGR Cooler Internal Leak
Mercedes-Benz
E-Class
2009
OM651 2.2 CDI
⚡ Quick Summary
Severity Level
High
Safe to Drive?
🚫 Do NOT Drive
Safety Impact
Direct safety risk — affects safe operation of the vehicle
Urgency Level
🟠 Fix Soon
Sweet-smelling exhaust smoke combined with coolant consumption without external leak on W212 E220d indicates an internal EGR cooler crack allowing coolant into the intake. This is the most common internal coolant loss on OM651 diesel. EGR cooler replacement: £400-800.
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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