Mercedes C250 CDI W204 OM651 EGR Cooler Pressure Test
Mercedes-Benz
C-Class
2011
OM651 2.2 CDI 204PS
Safe to Drive?
🚫 Do NOT Drive
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.
📋 About This Fault
Documented below is the Mercedes C250 CDI W204 OM651 EGR Cooler Pressure Test fault affecting Mercedes-Benz C-Class 2011.
🚗 Can You Drive With This Fault?
This fault is classified as unsafe to drive. Park the vehicle immediately and have it inspected before driving again. Do not attempt a motorway or long journey until the fault is resolved.
Repair / Solution
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