Engine Drivability Concerns Due to Broken Crank Case Vent Hoses on Mercedes-Benz C230

The engine crank case vent hoses may fail, resulting in a rough running engine and/or poor engine performance. Damaged hoses should be replaced.

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Average mileage: 98,413 (60,000–136,826)
3 model years affected: 2003, 2004, 2005
6 people reported this problem
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2004 Mercedes-Benz C230 60,000 mi,
Diagnosis was leak in crank vent system. Replaced all hoses. Replaced all seals. 5 days later engine light on again.