Mercedes C250 CDI W204 OM651 EGR Cooler Pressure Test
Mercedes-Benz
C-Class
2011
OM651 2.2 CDI 204PS
⚡ 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
EGR cooler pressure test on C250 CDI W204 should be performed at 100,000 miles. Cracked EGR cooler causes coolant contamination of the intake — white smoke and coolant loss. EGR cooler replacement costs £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 C-Class 2011 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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