Mercedes E-Class Head Gasket Symptoms — OM651 Diesel
Head gasket failure on W212 E220d is uncommon but happens at very high mileage (250,000+ km). Symptoms include white smoke with coolant smell, rising coolant consumption without visible leak and overheating. More common cause of coolant loss on OM651 is EGR cooler crack — always test EGR cooler first.
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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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